10” diameter x 5” high domes that are fillable at the top. Constructed of hockey stick-tough ABS plastic to withstand rugged institutional use. Light when empty (1 pound), and can be filled with up to 12 lbs. of your sand or 7 lbs. of water. Has slot to even fit Skinny No-Kink hoops! Each dome has 5 pole slots for multiple other obstacles, such as hurdles, targets, etc. The Jr. Domes serve all the same functions, except are 8” diameter x 4” high.