Anazao Gear is Commercial grade and is known and respected for superior, long lasting quality. Handcrafted in the USA * Lightweight, portable, and space-saving. * Steel internal core durable, thick, high density rubber for long lasting comfort and maximum cushion. * The butterfly sling - cotton fabric & fleece, heavy nylon and hook & loop, heavy duty D-rings. * Bushings on all connection straps on the bars for smooth, full range of motion.