These are urethane balls. Set of 15 Size: 42mm diameter Material: EVA Almost the same size as a golf ball For swing practice at home, indoors, or in the garden Also for pet toys Made of soft urethane material Won't damage furniture or objects Safe for beginners, children, and pets Lightweight and quiet The distance is reduced, so you can use it with peace of mind With colorful stripe lines, it's easy to see the ball's spin. Also for form improvement These are imported goods. We inspect new and unused items before shipping, but due to being imported goods, there may be minor stains, scratches, fraying, or loose stitching. Please refrain from purchasing if you are looking for perfection. Shipping via Yu-Packet Post. Anonymous delivery