Tear-Off Filler Mixing Board - Save clean-up time, save money. Mixing board includes 100 tear-off 8-1/2" by 11-1/2" mixing sheets mounted to a ridged piece of 1/8" tempered masonite. Sheets are gum banded on 3 sides to prevent tearing while mixing and applying fillers. Flexible back strap secures mixing board to your hand. Made in USA.