This set of 3 Acrylic "U" Risers contains the following sizes:

2"(H) X 5"(W) X 4"(D)
4"(H) X 6"(W) X 4"(D)
6"(H) X 6.5"(W) X 4"(D)

All risers are 4" deep and 1/8" thick