The Pit Bull Doz Piezas 2.2 Kompilation Dual Duro Foams offer incredible side-hill control, controlled tire-flex and a firm tread-bite that allows lugs to work individually on the toughest terrain. Dos Piezas 2-Stage Foams work with many popular 2.2 size tires, but were developed specifically for the Pit Bull 2.2 Rock Beast XOR Komp Kompound tires. Package includes two open cell 2-stage inserts. Stage 1: The Inner Stage supports the critical part of the tire's carcass, helping beefy crawlers and tall 2.2 tires maintain stability and predictability. Stage 2: The Outer Stage provides the deadening effect you need for hardcore climbing, sudden hopping and controlled bumping. Stage 2 also refines many rock crawling tire needs when hitting the big rocks and deep holes. Both stages of foam dampen, as well as react quickly enough for high speed runs seen in crawling and rock racing. No modifications are needed with Dos Piezas...they are ready to go right out of the package. Specifications: Outer Foam Dimensions: 90mmx140mmx72.7mm Inner Diameter: 90mm=3.5433 inches Outer Diameter: 140mm= 5.5118 inches Width: 72.7mm= 2.8622 inches Inner Foam Dimensions: 55mmx95mmx50m Inner Diameter: 55mm=2.1654 inches Outer Diameter: 95mm=3.7402 inches Width: 50mm=1.9685 inches