Action Domes™ and add-on items are non-intimidating, sting-free, gross motor skill developers for early grades. Domes include a locking center-hole pole support structure and four side holes for horizontal pole positioning. The optional Deluxe Action Domes™ include slip-resistant dipped rubber rims for safer step and stand-on balancing. Accessories include Hoops, Hurdles, Arches, and Posts. All these segments snap together, are interchangeable, and are the strongest blow-molded segmented pieces made for play! Domes are 9” dia. x 4” H. Domes are great indoors or out, but add-ons items are best suited for indoor play. Action Domes™ sold separately in dozens in COLORZ.