Protect the bottom of your sled and increase the life of the shelter tub! These runners are designed to increase the life of the sled by protecting the bottom from the rigors of pulling it across the ice with an ATV or snowmobile. They also reduce friction and drag, providing a smooth pull for anglers that drag shelters out on foot! The X-Series Runners are a thicker hyfax runner built for harsh conditions. The X-Series runner kits also come with multiple runners to cover each of the ridges on the tubs