Our own brand Philip Harris rimless test tubes offer high quality at an economical price.They are ideal for a wide range of laboratory applications.Manufactured from borosilicate 3.3 glass tubing, designed for maximum heat transfer and chemical resistance.Uniform wall thickness between 0.8 - 1.0mmAvailable in the following sizes:10mm x 75mm12mm x 75mm16mm x 125mm16mm x 150mm18mm x 150mm24mm x 150mm