This is a circular transparent type seal sealA gentle adhesive type that is convenient for sealing envelopes and letters. A firm seal that is slightly thicker than usual, so it prevents the seal from sticking to each other when removing from the sheet. 10 sheets per sheet, approximately 6.7 x 2.6 inches (17 x 6.5 cm) in compact size, so you dont have to worry about storage space.