Set of 6 1 Ebony Bridge Pins for Acoustic Steel-String Guitar We include these pins in sets of 7, so you’ll have an extra in case one is lost. Maximum diameter at the top: 5.1–5.4 mm Maximum diameter at the bottom: 4 mm Tapered length: 21.5 mm These bridge pins are compatible with all models beginning with OF or FF. They are not compatible with Puddle Jumper or bass models.