Important: Rip off the film covered on the surface after installed. Rosette Diameter: 5”/12.7cm. R=2.5”. Material: Real celluloid. Thickness: 0.8mm. Installation mode: 3M adhesive self stick Specially tailor-made for Martin acoustic guitars. Martin acostic guitar applicable except OM18V. Any standard acoustic guitars which have 2.5 rosette radius applicable. Any uncertainty exists, measure the radius of the rosette then catch the perfect result. It’s time to dress up your lover. Package Contents: Guitar Pickguard x 1.