Conveen® Security+ Male External Catheter Self-Adhesive Band Vinyl X-Small (551068_BX) 35/BXThis Conveen male external catheters are self adhesive and designed for external use. An applicator grip and a roll out strip allow for easy placement and use. The male urinary catheter has an anti kink bellows for convenient attachment to a collection bag. The bellows system also helps prevent leaking. They're extra small, have 21 millimeter diameter, are transparent and come in a box of 35.