Specification: Material: fiber Color: as shown in picture Size: Straight 1.2mm 1.4mm 1.6mm 1.8mm (each size 20pcs) Screw Thread 1.2mm 1.4mm 1.6mm 1.8mm (each size 20pcs) Top Diameter Bottom Diameter Length 1.20mm 0.90mm 18mm 1.40mm 1.00mm 18mm 1.60mm 1.10mm 18mm 1.80mm 1.20mm 18mm Feature: Fiber posts cannot corrode. Because the stiffness (Elastic Modulus) of fiber posts is like the tooth structure, they function with the tooth instead of against it, in helping to prevent fractures and other problems. Convenient to use. For dental use. Package included: 160 x Fiber Post 32 x Drill Note: Please allow a little size errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.