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You will receive a pack of 12 glass test tube with 12 silicone plug and three test tube clamp specification: capacity:20*150mm Material:glass bottles and silicone plug volume:36ml or 1.27 fluid ounces suitable for storing items that need to be kept dry. These versatile transparent glass tubes can be used in many applications, from laboratory analysis to food and beverage services, so you cannot miss this set! This is a very affordable product, add to the shopping cart now if you have any needs! If you have any questions about product, the first time contact us, We bear all accidents caused by non-force majeure.