Various knee blocks for the optimum leg position. With touch tape area on the back for individual positioning. Suitable for all Waldhausen saddles. Covered with leather. Measurements (length, width, weight in cm): DR big: 22.5 x 8.5 x 5 DR standard: 20.5 x 7 x 3 AP big: 21 x 7.5 x 4.5 AP standard: 19 x 7 x 4 AP Pony: 18 x 4.5 x 3.5