TORTOISE, 7 PINS, ENDPIN, STRAP BUTTON - Package of 7 faux tortoise shell bridge pins, one end pin with abalone dots. Also includes a faux tortoise shell strap button. These are really the closest in appearance to the real thing. They are made from Casein, a phosphoprotein of milk, which when combined with a mild acid and heat create this beautiful and hard wearing plastic. Perfect for dressing up your guitar and their density can even add to your instrument's sustain.