Rewriting how core and cover work together. From the SPI LAB Series, the Concept reverses the narrative on core/cover development for challenging patterns. The ARC Cover has the highest coefficient-of-friction values and sits right at the USBC limit on oil absorption time. Here the coverstock acts as both engine and tires, while the Radius Weight Block behaves like traction control — keeping the ball on-line to the pocket. Because the cover is so strong and the block so conservative, the Concept never wants to 'lock up' or run out of gas. Even with a very low diff, the cover forces the ball to keep hooking through the pins instead of carrying oil downlane. In 14–16 lb, it's a two-piece ball with a thick resin shell that raises COR for livelier pin action. Who It's For Challenging patterns — cover-driven traction that stays on-line to the pocket. Control-first players — a conservative block that never over-hooks or locks up. Pin-carry seekers — thick resin shell raises COR for lively pin action. Ball Specifications Color: Teal/Imperial Blue Coverstock: Arc Pearl Reactive Weight Block: Radius Weight Block Factory Finish: 1000 Abralon Flare Potential: Low Radius of Gyration (RG): 16lbs - 2.59; 15lbs - 2.61; 14lbs - 2.62 Differential (Diff): 16lbs - 0.019; 15lbs - 0.020; 14lbs - 0.019 Intermediate Differential (Diff): N/A Fragrance: Blueberry Fritter Backed by expert drilling, fast shipping, and the best prices on performance gear.
