Seki Golf Ball set include 2 golf balls with soft holder that made of durable and flexible silicone material, preventing your golf balls from falling and wearing. Each set can hold 2 standard balls which are made of synthetic rubber core with Surlyn cover, meeting your replacement need. Featured flat bottom allows you to put it on the ground wherever possible. A detachable carabiner clip attachment is convenient for you to carry the balls on your bag or waist belt. This silicone holder can be applied as a nice accessory for daily golf training and golf games. Tour golf ball available for upgrade upon request.