These reliable cleaning brush displays from Randy's are made of galvanized steel and nylon. Randy's Black Label brushes help to clean large water pipes and also help get the gunk out of your vaporizers. Randy's cleaning brushes are so versatile they are safe and effective on glass, metal, ceramic, silicone & electronics. Randy's Brush Features: Size: 8mm Length: 6" Long Made of Galvanized Steel & Nylon Great for Glass & Vapes