Outer Size 6×10″ 4×8″ 8.5×12″ 10.5×15″ 8.5×11″ 6×10″. Usable Size 6×9″ 4×7″ 8.5×11″ 10.5×16″ 8.5×11″ 6×9″. The high-quality self-sealing adhesive tape is tamper-proof and anti-counterfeiting.