Tube wall thickness is the spec that decides whether a training bar flexes, and this frame is built from solid A3 steel with a 0.06-in thick tube, which is what gives it the rigidity to hold a 220-lb max weight support without springing under a swing. The bottom supports are welded rather than bolted, so the two uprights stay parallel to each other permanently instead of drifting out of square every time the frame is moved. Height steps through 11 levels from 38 in to 55 in, adapting to children of different heights as they grow, and knobs on both the tube and the base clamp each setting so the bars cannot loosen during use, which is the failure mode that makes a cheap set feel unsafe long before it breaks. The rails themselves are bamboo, set at a 46.5-in inner width across a 99-in by 52-in by 55-in frame, and the parallel bar layout opens up a variety of exercise ways rather than a single hold. Assembly follows 7 clearly illustrated steps. The box also contains talcum powder for better grip and performance during gymnastics, which is the kind of detail usually left to be bought separately. Total product weight is 106 lbs, shipped across 2 boxes, and the set is sized for ages 6 to 12. It makes a gift for kids to exercise, keep healthy, and increase courage. Specification: Color: Purple/Blue/Pink; Material: A3 steel bamboo bar; Overall Dimensions: 99" x 52" x 55" (L x W x H) Inner; Adjustable Height: 38" to 55" with 11 levels; Net Weight: 106 lbs Age: 6-12 years old; Max Load Capacity: support: 220 lbs; Box Qty: 2; Package includes: 2 x Bamboo bars 1 x Steel base frame 1 x Talcum powder 1 x Instruction; Width: 46.5"