This tire is 30" in diameter with a 16" opening and is 10" deep. It is made of Polypropylene. This tire has built in eye bolts that will accept our H172 shackle. This is a great tire swing as no bugs or water can get in it and there is no rubber to wear off and stain the children's clothes. It weighs 19 lbs. and meets ASTM Standards that state tires must weigh less than 35 lbs. No more than 3 children at a time and each less than 35 lbs.