Graduated Dive Rings UNDERWATER DIVE GAME FUN - Swimline Graduated Dive Game Rings for Underwater Pool Time Fun - Classic Dive and Retrival Game - Numerically Labeled - Assorted Colors SET OF 4 DIVE GAME RINGS - Sand filled rings that stand up right on pool bottom for easy retrieval. FUN IN THE SUN - Swimline Graduated Dive Game Rings are labeled with numeric values and weighted with sand to stay up on the pool floor, they provide kids and adults with non-stop diving fun. Numbered 20, 40, 60 and 80 for different twists on game play MUST HAVE FOR THE POOL - Swimline Graduated Dive Game Rings are great for new swimmer/new diver practice, endurance training or for team relay fun. The dive rings are sand filled allowing them to sink to the bottom of the pool which adds another potential game - players race around the pool trying to collect them all before they sink!