Ideal for mounting pictures and attaching book jackets; available in 2 lengths on a 1" coreScotch 3M Double-sided Tape is a standard, multipurpose quality tape that can be used for everything from mounting pictures to attaching book jackets. Use with dispensers.1/2"W tape is available in 2 lengths on a 1" core.Overall dimensions:137M (tape with dispenser): 1/2 x 450"138 (refill tape): 1/2 x 900"