The Powerslide Stride Control is a small little plastic wedge that can be placed under the heel and bale of your skates. The wedges can compensate for physical deformation like pronation or supination which can cause discomfort and pressure points in your skates. The wedges correct your position on your skates, improve the comfort for better performance, and more fun on skates. They have little pins which perfectly match with Powerslide frames to stop the wedges from slipping. You don´t have a Powerslide frame but want to use the Stride Control? No worries just grind off the little pins and then just place the block between boot and frame. Make sure the block doesn´t move when you tighten the screw.