Doubleshot injection molded for maximum longevity, these keycaps are made from PBT plastic, long considered the superior plastic choice in keycaps. The set comes with four CTRL caps (two each of 1.25 U and 1.5 U), four ALT caps (two each of 1.25 U and 1.5 U), three shift caps (one each of 1.75 U, 2.25 U, and 2.75 U), and four card suit caps (1.25 U). As the set is compatible with all Cherry MX switches, it will work with most standard mechanical keyboards.