Strauss Chest Expander with 5 Springs with Hand Grip Portable upper-body workout equipment for exercising any-time, anywhere. Made with chrome steel and wooden handles for enhanced quality and durability. DURABLE CONSTRUCTION & ERGONOMIC DESIGN - The material of the hand grip strengthener is good-quality ABS plastic, plus stainless steel tension springs, which make the hand grip strengthener more durable. Durable construction & ergonomic design ADJUSTABLE RESISTANCE - Hand grip strengthener can be adjustable from 22 to 88 lbs (10 to 40 kg). It can satisfy different power levels, from the beginners to the advanced.