Simply throw this submarine ring into the water, look at the sunken and then dive to get them This is a good way to improve children's swimming and diving skills. Sinking rings for underwater swimming are an excellent way to help swimmers improve their skills, our diving toys are a great addition to any party in the pool. The children's diving toys are a great gift for your children at your birthday party, summer vacations, swimming classes, etc. Swimming diving rings are made of PVC material, our sinking ring is lasting and environmentally friendly to use. The swimming diving rings is pool toys with bright colors, easy to grab for young swimmers. color:as shown Material:plastic Package Contents: 4 x Small fish ring 4 x Circle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.