Extend the life and high-mileage durability of your Otter Sled. These 5/8-thick high-density runners bolt into the bottom of your Otter sled. Adds easier mobility and extreme wear resistance to your long-distance hauls. Available: Medium Model #1236 Fits Otter Pro and Wild Medium sleds. Magnum Model #1246 Fits Otter Magnum and Wild Large sleds. Type: Sled Runner Kits.