Although Tractor Tread Rings are the coolest silicone rings ever, they are not invincible. They will not last a lifetime like a metal ring. Because the tread is raised and they are made of silicone, over time the tread can wear down. Just like real tires, the tread will wear according to use. The material used is a very tough elastic formula of silicone designed to last as long as possible and still be very flexible. Tractor Tread Rings cannot guarantee that the tread will not wear. Check our Handshake Guarantee if excessive wear happens within the first year.