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 H173 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. Tire is intended for use of no more than 3 children at a time and less than 50 lbs. each. This product should last 2 years in harsh conditions and up to 5 years in optimal conditions. Some conditions may require replacement sooner. Tensile strength 1000 lbs..