Dispose of your used coffee grounds quickly and easily within inches of your espresso maker.Black espresso knock box give you ample storage space for holding the residual coffee grounds so that you can later transfer them to a compost bin.The espresso machine knock box capacity is large enough that you don't have to empty it too often, made of sturdy ABS plastic with a food-safe rubber bar.Rubber bar can be removed from its plastic holder for emptying and cleaning,The bar comes out easily for fast cleaning.The puck box features a non-slip rubber pad on the bottom to stabilize the knock box and reduce noise, prevents sliding and wont scratch kitchen countertops.