Packet contains 20 pieces 105x149mm (A4 cut into 4). Acetate is easily cut with a craft knife or scissors. Create your own stained glass lead light by using pemanent pen markers to colour stickers on acetate. Stablize 3D layering with peel off stickers and acetate. Acetate is great for shaker cards and also as a "window" layer in scrapbooking and card making. NOT HEAT RESISTANT.