Premium Material : well made and well finished, Made of Zinc Alloy environment-friendly steel , good texture with fine workmanship, solid, firm and durable to use, ensures a long service time.[EASY TO INSTALL]Guitar bridge comes with screw, springs and other mounting accessories, no extra tools needed, very easy to install and operate.[FANTASTIC AUDIO QUALITY]This is a fantastic tremolo for manually creating a true vibrato.This is highly controllable within its range of motion and requires little force to operate.[GREAT ACCESSORY]Great guitar accessory part, quite suitable for ST guitar.Colour:blackMaterial:Zinc alloyPackage Contents:1 x upper pillow1 x rocker3 x hexagon wrenches (M1.5, M2.5, M3.0, 1 pcs each types)4 x large screws (M3.6 x 26.8)2 x small screws (M3.0 x 25)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allo