Channel-Z - For Better Speed and GripChannel-Z is a special tool used to create a channel in the middle of the skate blade. This innovation reduces friction between the ice and steel, resulting in increased grip by utilizing four edges instead of two. With Channel-Z, you can skate on a flatter profile than before, providing smoother and faster skating.We recommend sharpening 2-4 cycles per session to optimize the effect.Please note that Channel-Z is intended for use exclusively on the Skatepal machine.