8" X 10" sheet. This mylar tape will never lift, curl, warp or distort when heat is applied. Wonder Tape is an acid free, double sided mylar tape. It is heat resistant. Peel off protective white liner, lay on clean surface and peel off protective red liner. Sprinkle on embossing powder and use heat gun to melt. It will not lift or curl, even when heated, and will hold all types of glitter and small beaded embellishments permanently.