Made of fiberglass.
 
Sizes:
	
Large 21.75″ x 27.25″ Base: 13″
	Weight: 18 lbs.
	
Medium 14.25″ x 17.75″ Base: 9″
	Weight: 9 lbs.
	
Small 8.75″ x 11″ Base: 5.25″
	Weight: 5 lbs.