Red Brush Tips, 500/Pk. Tight, adjustable brush fibers minimize bubbles. 0.79 mm inside diameter allows controlled delivery and less waste. Contains tight and adjustable fibers. Administers viscous and highly saturated material. Reduces the formation of trapped bubbles. Works deep into the fissures. Inspiral Brush Tips are red plastic, curved tips that resemble an intraoral tip, with brush bristles at the 0.79 mm inside diameter of the point.They provide smooth delivery even with viscous and highly filled materials while minimizing the formation of bubbles that causes weak bonds. The fine fibers work resin deep into the crevices when applying sealants evenly at the desired site.