Heavy duty steel spring with adjustable stabilizer and adjustable wrist pad to control tension help build powerful wrists and forearms for enhanced performance in any sport.Foam padded for extra comfort and protection. Perfect size for travel! Size: 5.5 inch wide, 10.7 inch long, Spring Thickness: 0.5 inch,Weight: 415g.Firm grip contour design Compact and portable.Material: stainless steel spring + black sponge set. Size 10.7 X 5.5 Inch