The raising block kits give the sandals that extra bit of height where needed! Risers are a kit of 4 plates with screws that raise one sandal into 4 different heights. Order one (1) set to accommodate a leg length discrepancy. Order two (2) sets to raise the height of the footplate to maximize the available growth. 1 Riser = 0.7 2 Risers = 1.3 3 Risers = 2" 4Risers = 2.7"