Clear tape - it fits perfectly on our tape dispenser, it has 75M on a roll which is enough to do around 25-30 boxes. Depending on how many wraps and the style you put into doing the box up! We like doing a "H" on each end, but if you want to do a big X, and you like it, then go for it.
Its natural rubber, its sticky and it does close a box really rather well.
