This is a older, USED package of crystal mounts, used in stamp collecting. There are 24 tubes in the package. They measure 12 inches long X 1 & 1&1/16 inches high. They will fit stamps without folding over. Crystal mounts are non-shrinking and will not chemically injure stamps. They actually protect stamps even over long periods of time. Easy to use, just insert your stamp and cut to size needed.