PROLINE 1.9 Inch DUAL STAGE CLOSED CELL INSERT FOR XL TYRESPro Line is proud to introduce our next generation of Rock Crawling Performance Foam Inserts: the all new 1. 9 Dual Stage Closed Cell Inner Soft Outer Foam! Pro Lines new inner inserts are made from lightweight and waterproof Blue Closed Cell Foam while the outer is made from Soft open cell foam. When combined they are perfectly sized for Pro Lines 1. 9 XL sized Rock Crawling Tyres. The inner Closed Cell inserts are completely contoured to correctly