Materials: Natural Rubber and Reclaimed Rubber. Hardness: From 75 to 85 shore A durometer. Colors: Black color Applications: Boat Trailer Rollers are main used to boat trailer, to aid the boat and personal yacht to betrailered, it can protect them prevent any possible damageMaterials: Natural Rubber and Reclaimed Rubber.Hardness: From 75 to 85 shore A durometer.Colors: Black colorTemperature Rage ...