FOR LETTER SIZE:The binding combs mainly for letter sized (8.5x11 inches) paper, and they can be reopened to add or subtract pages as needed.
PRECUT COMBS:Each HOUYEE comb binding spine is 12 long and fits a letter-sized book, document, or binding project. The flexible plastic spine can also easily be cut with scissors to accommodate smaller projects.
MATERIAL: Sturdy raw materials ensure that the plastic binding combs won't chip, scratch, peel or discolor and can be re-used.
EASY TO USE: HOUYEE plastic binding combs are compatible with any standard 19 ring comb binding system.