What material are First Aid Only eye cups made out of?

All First Aid Only eye cups are plastic. 

7-110	Sterile Eye Cups, 10/box
7-111	Sterile Eye Cup, 1/box
7-1100	Non-Sterile Eye Cups, 10/box
M795	Eye Cup, 6/vial
7-600	4 oz. Eyewash, Eyepads & Adhesive Strips, 1 set/box