1. Made of 100% medical grade silicone, have good biological compatibility. 2. Smooth tapered tip of catheter facilitates easy introducing to the urethra. 3. The drainage eyes are accurately formed to permit affective drainage. 4. The symmetrical balloon expands equally in all directions so as to perform its function of retaining bladder efficiently. Color-coded sleeves are useful for easy and rapid size identification. 5. Different check valve include the type of with Luer-lock and without Luer-lock. Company: Integral Medical Products Co., Ltd.