Pro-Line Racing 619201 1:10 Scale Closed Cell Foam for Truck, 2-Piece.This is a pair of 1:10 Truck Closed Cell Inserts. Choosing the right insert for the right condition can be the difference between winning, losing, or just plain having bragging rights over a compeor on the track. Pro-Line now offers an aftermarket insert for you 1:10th scale truck enthusiasts to use on those tracks that desire a firmer and longer lasting insert set-up. Want to save money on your favorite hobby? Then choose the Closed Cell inserts because they are water safe and reusable! Please note: All tires & wheels are sold in pairs, unless otherwise noted.