Backing Boards to be used with Kandi Corp Hot Fix Crystals and Crystal Template Material (B80302) and the Crystal Transfer Film (B07124). Can use Crystal Brush (B80301) with this as well. 8 sheets per pack measuring 8.5" x 9.5". For use under the Crystal Template Material, and after it has been punched. Helps to stabilize the Template Material when affixing the crystals.