Pop-up aluminum foil sheet is our strongest product: All of the sheets are interfolded in the box, you can take them one by one when you want to use. No cutting, no tearing, it' s so convenient than the common sheets packing, it also have the good market. For the sheet' s size we have: 23x27cm, 27x30cm, the packing have 200sheets/box and 500sheets/box .