This hand grip strengthener is made of top-quality Silicone, not easy to tear. It is washable and can be used frequently and comfortably. It fits all age groups and fits all hand sizes, unlike other "pinkie hole straps" on the market. Easy to carry, easy to put into a bag or pocket. You can repeat it while driving, in the office, or anywhere! Price over 20,000pcs is via sea freight.