Karter Scientific is a registered trademark in United States of America. To maintain quality control, authorized permission is required in the resale of our products. Best selling 60 tube plastic test tubes set with rack and caps. Includes (60) Laboratory Quality 16x150 Polystyrene Test Tubes, 10 each Red, White, Blue, Mauve, Green & Natural 13mm Caps to fit. 1 (90) Place Test Tube Rack.