The DoolyTM has two 7/16” Flat-top runners mounted on a plate for each ski. The four contact lines on the snow surface will help decrease darting of your sled as it makes its own groove in the trail. When in a turn, only one of the DoolyTM bars will be in contact with the snow or ice. Therefore, a DoolyTM with 6” of carbide on both runners will have the same turning power as a single runner with 6” of turning carbide. The DoolyTM is available in 4”, 6”, and 8” of 60o turning carbide for Arctic Cat, Polaris, Ski Doo and Yamaha snowmobiles. Each DoolyTM is packaged individually.