Specifications:Features:- 5 buttons initiated, one more button than the common exerciser, with more function, more powerful.- Exquisite design to make MFX5 high class.- Copper core, adjustable force, make operation smooth and accurate.- Exclusive "Lock Button" function, the optional stainless steel piece can lock max 2 buttons.- This exerciser can improve finger strength and force accuracy to the highest level.Product Name: MFX5 Guitar Hand Finger ExerciserTension Range: 3 ~ 8.5lbButton Quantity: 5Can lock max 2 buttons simultaneouslyColor: White / OrangePacking: Blister boxesPackage Weight : 134 G / 4.73 OuncesPackage Dimensions (L*W*H) : 200*160*80 MM / 7.87*6.30*3.15 InchesRetail Packaging: No, No PackingPackage Include:1 x MFX5 Guitar Hand Finger Exerciser