From the PBA site.
Utilzing completely new technology, the Forzaâ„¢ is precisely tuned for a smooth and powerful motion on medium oil. It is engineered using the new Torxâ„¢ weight block design and Helixâ„¢ Solid Reactive cover stock.
The powerful new Torxâ„¢ engine driving the the Forzaâ„¢ produces a 2.50 RG and .051 differential on the 15# model. It revs up easily and is capable of producing over 5 inches of track flare.
The new Helixâ„¢ Solid Reactive shell on the Forzaâ„¢ is formulated to produce the friction required to read the mid-lane incredibly well, yet still display devastating continuation. This neon orange and gray cover is finished at the factory with a 3000 Grit LSS tread.
• Performance Target: Medium Oil
• Inner Core: Torx™
• Coverstock: Helix™ Solid Reactive – NEW!
• Finish: 3000 Grit LSS
• Weights: 12# - 16#
• 15# Specs: RG - 2.50, Diff - .051
• Flare Potential: 5+ Inches