This Lab vials is applied to store volatile organic solution such as acetone, alcohol and acid type solution. Also great for storing essential oils, flavours, perfume blends, samples, dry goods. These vials are maded of high borosilicate glass, not easily to leaking, corrosion and drop resistant for repeated use, and are tough enough to withstand the rigours of daily use. The Brown Sample Vials offer air-tight seal with their PE liner design, ensuring that your solutions are safely stored without any contamination. The plastic black screw caps provide a secure closure that minimizes the risk of any leaks or spills. Size: 18mm x 43mm with cap on. Package - 5ml 50pcs sample vials. Comes to you in a safe and secure packaged sturdy paper box which can effectively prevent from breaking during shipping.