Feature: 1,Made of latex. 100% silicone coated. 2,Good biocompatible materials, no urine crystal deposited, relieve the tissue irritation. 3,Symmetrical balloon expanded equally in any direction so as to perform its functions safely and efficiency. 4,Silicone coating and smooth processed tube top protect against the urethral mucosal injuries. 5,Symmetrical balloon for good retention catheter in the bladder temporarily, reducing discomfort. 6,Color-coded sleeve for easy identifying of sizes. 7,Soft rubber or plastic valve is optional.