TruCath Red Rubber Intermittent Urethral Catheter, 20 Fr, 16'' Length.TruCath Red Rubber Intermittent Urethral Catheters are 16 inches long. The catheters have a smooth tip and pliable latex material that promotes ease and comfort during insertion. TruCath Red Rubber Intermittent Urethral Catheters are designed for short-term use, and are available in size 8 Fr through 22 Fr.