V2 has a worldwide reputation for good roller ski ferrules. Roller Ski Ferrules take a real beating so V2 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 fist 9 to 11mm poles, the yellow fits 7 and 8mm poles.
Assemble using a low melt glue stick. We use a heat gun to melt the stick a bit, then rub the melted glue onto the ski pole and attach the ferrule.
To remove, use a heat gun to loosen the glue, or dip pole/ferrule in a cup of boiling water to loosen the glue.