Assortments of five 3-5/8" squares slabs in the following thickenss:
1-7/8", 1-11/16", 1-3/8" and two 3/16"
Available in three degrees of hardness, designated by color:
#21.380 --- Blue --- Will bend 90° in 1/8" thickness
#21.381 --- Green --- Cannot be flexed
#21.382 --- Purple --- Some flexibility