18Pcs Glass Test Tube, 25×120Mm Clear Flat Test Tubes with Cork Stoppers for Pla
Length: 120mm / 4.8in. FURTHER APPLICATION: glass tubes cork stopper has a good seal. The bottom of the glass test tube is flat so it can be placed upright. ROTATE the lid to ensure tightness. Nice cork stoppers enable good sealing performance and effectively prevent liquid leakage.