Molded plastic colored to look like the bone material found on early Fender guitars. Sized and curved to fit the machined nut slot on your guitar or bass. I measured 2.021" length, .130" thickness, .176" tall. Fits old and vintage reissue Stratocaster, Telecaster, Jazzmaster, Jaguar, Mustang, etc. Plenty wide enough to fit vintage Fender basses too. Brand New. Genuine Fender 0994920000. UPC 717669507244.