For the most intense ball-crushing play, this board can apply pressure to both the cock and balls or just the balls, by simply inserting them through the back hole. Then screw down the wingnuts to apply more and more pressure. If you desire you can have only your balls crushed you can simple slip your cock through the handy cock hole on the other acrylic board. The both plates of the board are made of durable clear acrylic. Both plates measure 5 in. wide and 7 in. long. The cock hole measures 1.75 in. diameter and the ball hole measures 2.25 in. diameter.