A Urinary Catheters is any type of catheter that is being inserted into the body to drain urine from the bladder. The most common type of urinary catheters are intermittent straight tip. These can be made from a variety of different substances depending on what your doctor thinks is appropriate for you. Urinary catheters can be made with latex, rubber, silicone or many other substances. Urinary catheters also come in many different sizes and can be different for each persons needs. Your doctor will know which size is right for you. You may hear the size of the catheter referred to as “French” proceeded by a number designation. For example, 14 french. Most urinary catheters range in size from 8 french to 22 french. The smaller the number the smaller round in diameter the catheter will be.