Klmnop 30 Pcs Borosilicate Glass Test Tubes, 4 Inch Straight Glass Tubes, 2mm Wall Thickness with 6 Cleaning Brushes for Blowing, Lab, DIY, Industrial(12mm OD 9mm ID)

Product Features: 30 pcs 4 inch glass test tubes with 6 cleaning brushes for blowing, lab, diy, industrial Specifications: Product Material: Glass Product Color: Clear Product Size: Glass tubes: 10 x 1.2 cm /4 x 0.47 inch Brush: 18 cm/7.09 inch Package Included: 30 × glass tubes, 6 × brush 1.6 long brushes clean inside 4inch tubes after each experiment. 2.Lightweight set of 30 tubes fits neatly in lab drawers or toolkits. 3.Easy to use. Works well for scientific and laboratory experiments.

• Complete Set: This value pack includes 30 glass test tubes and 6 cleaning brushes. The brushes easily clean inside glass test tubes, keeping lab tubes ready for next use
• Strong Glass Material: Made from thick & sturdy glass, these straight glass tubes resist thermal shock, suitable for lab tubes and glass blowing applications
• Size Information: Each glass test tube is 4 inches long, with 12mm outer diameter, 9mm inner diameter and 2mm wall thickness. The uniform size fits common use demands well
• Easy Smooth Cleaning: The inner and outer surfaces of glass tubes are smooth. Paired with matched cleaning brushes, you can finish tube cleaning easily after use
• Versatile for Multiple Uses: These straight glass tubes work well for glass blowing, laboratory work, DIY crafts and industrial projects, serving multiple daily applications