Good quality natural bristles, mounted in twisted heavy gauge galvanized wire. All brushes feature a radial top. Additional Info: Test Tube Brushes With Natural Bristles, 3" X 0.5" X 8", Pk/12 Package Size(L x W x H): 8.5 X 4 X 1.5 (IN) Categories: Brushes, Test Tube HTS Code: 9603.90.8050 UNSPSC: 4.11032e+007 Country Of Origin: INDIA