The 40 inch mini trampoline is made of commercial high-quality steel material, non-slip adjustable handle, suction cups for the feet and resistant PP woven stretch fabric material which make the exercise trampoline more safe and durable to use, suitable for kids and adults. Stylish & High-quality Protective Sleeve. You can adjust it from 100cm to 120cm by knob beside the handrail. Suitable for people of different heights and ages. Rattantree 40″ Folding Trampoline, Rebounder Trampoline in Black