(50) CheckOutStore Plastic Storage Cases for Rubber Stamps (Clear/Spine: 21 mm) CheckOutStore Brand 100% New Virgin Polypropylene Material Full clear graphic overlay for artwork insertion Approx Case Dimensions: 135 x 190 x 21mm (5 3/8" x 7 1/2" x 7/8") Spine Size: 21mm (7/8")