Prohands Hand Exerciser PM-15003 PRO X-Heavy/Dark Gray ・Unique structure equipped with four independent springs and buttons for highly effective training. ・Total training for each finger, the entire hand, wrist, and forearm. The resistance for each finger is 11LB (approx. 4,990g). ・Slightly larger specifications compared to Gripmaster. The frame is made of high-quality plastic material with the properties of polycarbonate and ABS resin. ・Uses larger stainless steel springs than those found in the Gripmaster series. I am selling this because I no longer use it. There are no issues with its use. Please check the photos for the condition. Please purchase if you understand that this is a used item.