SWAG Dragon Stained Glass Poly Bowling Ball

📋 SWAG Dragon Stained Glass — Full Specifications

• Core Name: SWAG 3 Piece Core
• Core Shape: Symmetric
• Coverstock Name: SWAG Polyester
• Coverstock Type: Plastic / Clear Polyester
• RG (15 lb): 2.69 — High RG; ball stores energy through the front of the lane and rolls out cleanly
• Differential (15 lb): .006 — Minimal; near-zero track flare for consistent, repeatable straight-line roll
• Flare Potential: Low — 0–1 Inches
• Surface Finish: Polish
• Preferred Lane Conditions: Dry / Spares
• Performance Level: Entry / Spare Poly Line
• Available Weights: 10, 12, 13, 14, 15, 16 lb
• Colors: Multi (clear stained glass design)
• Release Date: February 2026
• Brand: SWAG Bowling

🎓 RG 2.69 and Differential .006 — Why Spare Balls Are Engineered at the Extreme End of the Spec Range

The Dragon Stained Glass lists an RG of 2.69 and a Differential of .006 — and both of those numbers are as far in one direction as bowling ball physics permit. Understanding why helps explain what makes a well-engineered plastic spare ball different from a generic one, and why these specs are the correct design target for any ball whose primary purpose is straight-line spare shooting.

RG (Radius of Gyration) — what 2.69 means: RG measures how far the ball’s mass is distributed from its center. A low RG (around 2.45–2.50) means mass is concentrated near the core — the ball transitions from skid to roll early in its path, reading the lane sooner and generating earlier hook potential. A high RG (2.65–2.70) means mass is distributed toward the ball’s outer shell, which causes the ball to resist transitioning into roll for longer. It skids farther down the lane before the roll phase begins. For a spare ball, this is exactly what you want — a ball that stays in skid mode longer travels more predictably on a straight path, is less sensitive to lane friction variations, and arrives at the pins with more of its initial energy intact rather than burning it off in early roll-out or direction change.

Differential .006 — what near-zero means in practice: Differential measures the difference between a ball’s maximum and minimum RG axes — in practical terms, it’s the primary driver of track flare. High differential (0.040–0.060+) means the ball’s track migrates significantly as it travels down the lane, exposing fresh coverstock to the lane surface repeatedly and generating the aggressive friction response that reactive resin hook balls are built around. A differential of .006 is as close to zero as a USBC-approved ball can achieve — essentially no track migration, no fresh coverstock exposure, no friction amplification. The ball rolls on the same track from release to the pins. For spare shooting, this is the mechanical foundation of consistency: the same path, the same friction profile, the same roll-out point, every single shot.

Why these two specs work together: High RG delays when the ball begins to roll. Low differential ensures that when it does roll, it rolls straight without track migration pulling it off line. The polished surface finish adds a third layer to the same design intent — polish reduces friction contact at the lane surface, further delaying any friction response that could cause direction change. All three variables point the same direction: keep the ball going straight, keep it going far, keep it consistent. That’s the spec sheet of a well-built spare ball, and 2.69 / .006 with a polished finish is the textbook expression of it.

💡 BowlersMart Tips: Building a Complete SWAG Arsenal — From the Stained Glass Spare Ball Up Through the Reactive Lines

The Dragon Stained Glass is the foundation of a SWAG arsenal — the spare tool that every setup needs regardless of how many reactive balls are in the bag. If you’re new to SWAG or building out your equipment with the brand for the first time, here’s how the lineup structures from the spare ball up through the reactive lines, and what each tier is designed to do.

The foundation: Dragon Stained Glass (Entry / Spare Poly Line)
The spare ball. Goes straight, handles any lane condition for spare shooting, straight-line delivery for corner pins and cross-lane conversions. This ball stays in the bag at every stage of the arsenal. The Stained Glass is the premium expression of this role; the Dragon Midnight and Cotton Candy are additional colorway options at a lower price point if budget is a priority.

Entry reactive: Primary Performance Line
SWAG’s entry reactive line is designed for developing bowlers who are ready to move past straight delivery and begin working with hook potential. Controllable motion, house-shot friendly, and built for the bowler who is still developing rev rate and release consistency. A natural pairing with the Dragon spare ball for a complete two-ball beginner or intermediate setup.

Mid-performance: Modern and Utility Performance Lines
The middle tier of the SWAG lineup covers the widest range of common lane conditions — medium oil house shots, lighter patterns, and the varied conditions found across recreational and competitive league play. These balls offer more defined backend motion than the Primary line while remaining manageable across a range of player styles. The Utility line in particular is built for versatility: one ball that covers multiple conditions without requiring constant switching.

High-performance: Superior and Advanced Tech Performance Lines
SWAG’s flagship performance equipment. The Superior Performance Line — including balls like the Unreal Solid and Assassin Pearl — is where the brand has built its competitive credibility, delivering genuine high-end performance at prices significantly below the major manufacturer premium. The Advanced Tech Performance Line (Judgement Hybrid and others featuring SWAG’s AP26 adhesion promotion technology) represents the current state of the art in SWAG’s research and development, engineered for serious competitive players on heavy and medium-heavy oil patterns.

A complete competitive SWAG bag typically looks like this: Dragon Stained Glass for spares, one or two balls from the Superior or Advanced Tech lines as primary strike balls for different oil conditions, and potentially a utility or modern line option for specific pattern coverage. The Dragon Stained Glass makes that bag complete — and with the stained glass design, it makes it look as serious as it performs.

Earn points on every SWAG purchase at BowlersMart through the Striking Rewards loyalty program — building your arsenal earns rewards toward whatever comes next in the lineup.

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