The 14" (47 cm) inflated tube extends above the water, allowing you to reach over and pick them up. Key Buoy rises to the surface in as fast as 60 seconds. May take longer in deeper water with maximum weight attached. Strong enough for items weighing up to 2.8 ounces (80 grams) such as keys, small tools, deck plate keys. Suitable for single use only, so keep a spare on hand!