Our rollerskis ferrules come in 10 mm (black) and 8.5 mm (red) diameter. Great quality long lasting carbide tips saving you money over other brands. Replace your snowbaskets with these so you don't have to replace your snow baskets which are more expensive. To remove snow baskets, use a heat gun or boil water and dip them in to loosen the heat sensitive glue. Slide off baskets and then using some hot glue, slide on the ferrules and make sure they are pointed forward so they'll stick into pavement when poling. If you don't have a hot glue gun, just buy a hot glue stick and melt with a lighter and dab onto the pole end before sliding on the ferrule. Always use heat sensitive glue so they can later be removed. Priced per pair.