Kids Diving Rings are great gift for your kids on their birthday party, summer holiday, swimming lessons, ect. Sinking ring for underwater swimming is a great way to help swimmers improve their skills. Made of PVC material, our Sinking Ring is durable and environmentally friendly to use, safe to kids. Simply throw this Underwater Ring into the water, watch them sink and then dive in to get them. Swimming Diving Ring is 13.5 cm in diameter, with bright colors, easy for young swimmers to grasp. Color: As shown. Material: PVC. Just throw the diving ring into the pool, wait for them to sink to the bottom, and then chase them. Package Including 12(3 set)* Swimming diving ring