Swim Training Paddles Hand for Kids,Girl,Boy,Youths,Teenager,Swimming Pool - 2 Pieces. Polypropolene paddle,Silicone strap. The silicone straps are comfortable and easy to adjust. Palm hole allows feeling of water passing to encourage proper stroke motion. Designed to Increase Arm Strength and Develop Skills,Low Impact Workout Lightweight Training Aids. Holes in paddle allow better feel of the water.