Dental Fiber Post Glass Quartz Straight Root Canal Pins Dentist posts. For 3M Dental Fiber Post 10Pcs/Pack Material:Glass, 65% Fiber Available Model: Post:1.1mm-White, 1.3mm-Yellow, 1.6mm-Red, 1.9mm-Blue. For 3A Dental Fiber Post Material: Quartz Fiber(65% Fiber) Type:Straight Available Model: 1.0mm Black, 1.2mm Yellow, 1.4mm Red, 1.6mm Blue.Feature: 50% more radiopaque 20% stronger Enhanced retentive strength FDA approved. The sale of this item may be subject to regulation by the U. Food and Drug Administration and state and local regulatory agencies.