Selecting a urinary catheter is based on several factors, including catheter type, catheter size, catheter tips and assessing the risk of urinary tract infections (UTI). Catheters are constructed of thin plastic, vinyl, silicone or rubber. Urinary Catheters, in particular, are used to deliver or remove fluids to or from the body, typically entering the bladder. The process of catheter insertion is called catheterization. Urinary catheters are manufactured in widths usually designated in French sizes, and length, usually designated in inches or centimeters. LifeSupply.ca has a wide selection of the urinary catheter types most commonly used, which include: External Catheters, Intermittent Catheters, and Foley Catheters.