Frame > Angle Iron construction. > 1/4" round rod zigzag wire is welded on for spring attachment. > Predrilled holes, staggered on top and side for pit attachment. > Bolt package for anchoring your pit trampoline into concrete. Springs > 9" high quality spring is standard (108 qty). > Can customize to your choice of spring size. Beds > 100% black Polypropylene fabric, great for indoor as well as outdoor use. Other options are available (see below). > Spring attachments have double webbed configuration for added strength. > Corner spring attachments for added safety. > Other types of beds available - US and Ross String Beds, Web Beds or High Performance Beds for additional charge. Only Poly beds are recommended for residential use. Pads > All units come complete with a full pad covering frame, springs and corners. Pads are blue. Other colors are available for $130 more - red, green, yellow, gray. > 1 1/4" thick cross-link foam covered in heavy duty 18 oz. vinyl. > Attaches to frame with hook/loop fasteners.