ROETIN Carbide Runners have all the features you need for various levels of performance, from the casual trail rider to the extreme. The X-10 ONE Carbide Trail/Touring uses 4 of 90 deg. carbide on a 7/16 bar with 1 wear pads front and rear combined with an extra long master weld fiber. The X-10 TWO Carbide Agressive Trail uses 6 of 90 deg. carbide on a 7/16 bar with 1 wear pads and a full-length master weld fiber. The X-PR 1 Carbide High Performance/Trail uses 6-1/2 of 60 deg. carbide on a 1/2 bar with FOUR wear pads for longer life. The X-PRT Carbide Extreme/Agressive is designed for the high performance snowmobiler, and boasts 9 of 60 deg. carbide on a 1/2 bar, with FOUR wear pads to extend life. The ROETIN carbides also feature 1 studs to accept ski skins. Sold in pairs