Uro-Con male external catheters are composed of three pieces: a sheath, an insert and a 2" or 4" (5 cm or 10 cm) of pliable, white-rubber tubing and range in size from 25 mm being the smallest to 40 mm our largest. Each Uro-Con is packaged in a window pouch with or without Urofoam adhesive foam strips or Uro-Prep; protective skin wipes. Every pouch has detailed, illustrated application instructions on the back side relative to the contents of the package.