Description Charcoal Foam Bases – For use with the WPS exposure unit and other lamp based exposure units. The smaller foam is placed on the ground first to increase the height, the second foam is placed on top of the smaller foam. Sizes Available :- 12.5″ x 8.5″ x 4″ for use with 12″ x 16″ screens. 16″ x 20″ x 4″ For use with 20″ x 24″ plus 17″ x 13″ x 4″ for use with 16″ x 20″ screens
