Our own brand of Philip Harris test tubes offer a high quality test tube at an economical price. Can be used for a wide range of laboratory applications. Manufactured from borosilicate 3.3 glass tubing. Uniform wall thickness between 0.8 - 1.0mm. Designed for maximum heat transfer and chemical resistance. Rim tubes include a sturdy lip.Tube Dimensions: 10mm x 75mmPack of 100