17 x 100 mm, Clear Plastic Graduated Test Tubes with White Caps, 25 Pack, KeL Scientific KS-0958-WC25 Test tubes are manufactured from premium grade polystyrene. Polystyrene has glass-like clarity. Manufactured fromFDA food grade safe plastic Certified RNase and DNase free test tubes Hollow top caps are manufactured from low density polyethylene (LDPE) Graduations are marked 1-15 ml Test tube length: 100mm (315/16in) Test tube outside diameter (OD): 17mm (11/16in) Test tube inside diameter (ID): 15mm (9/16in) Test tube volume: 16ml (.54oz) Cap length: 18 mm (a little less tthan 3/4 in) Cap inside diameter (ID): 15mm (9/16in) Cap outside diamter (OD): 17mm (11/16in) Neither the test tube or cap are autoclavable Test tube max temperature use: 158 F (70 C) Cap max temperature use: 176 F (80 C)