Hand Strengthener - Adjustable Tension Exerciser By Multis Fitness ADJUSTABLE RESISTANCE - Variable tension from 22 lbs to 88 lbs (10 kg to 40 kg) EASY TO USE - Easily usable on left or right hand and made to fit small and large hands HEAVY DUTY DURABLE DESIGN - Rubberized grip for maximum comfort and made with quality materials for long-term frequent repeatable use COMFORT GRIP - Sleek and compact design with rubber grips MONEY BACK GUARANTEE - 100% risk free 365 day money back guarantee - if you are not 100% absolutely happy with your product, return for a full refund - no questions asked.