Premium-quality, high-density foam tires (25deg - white substance) arranged on strong 34mm-wide XRAY Starburst tires (made purposefully softer for extra hold). The foam tire is sturdily fused towards tires and pre-trued to an optimal start diameter. Are trued using HUDY Tire Truer with exclusive wheel adapter. Fits M18MT. Band of 2 mounted backside tires.