V2 has a worldwide reputation for their durable, high-performing roller ski ferrules. Roller Ski Ferrules take a real beating so they used the toughest Du Pont plastic and premium carbide steel tip making them stronger and more durable than any other brand. The black colored housing fits 9 to 11mm poles. The classic carbide tips give you a snow like feel while reducing the risk of elbow and shoulder injury, V2 Roller Ski Ferrules are the best you can get. The V2 Roller Ski Ferrule is easy to assemble and does require a low temp glue. Model VP-RST10 (fits 9 to 11mm).