If you are looking for a practical sealing plug, this product will be a good choice for you. This is sealing plug, which is made of high-class rubber material for practical and long-term use. Simple in structure, very easy to use. Features -Color: White -Material: Rubber -Size: About 1.70X1.30X0.80cm/0.67X0.51X0.31inch - The plug is made of rubber, good sealing, which has a . - Simple in structure, very easy to use. The sealing plug can greatly meet your scientific research use. - Great for most kinds of scientific laboratory utensils, such as test tube, flask, or other laboratory applications. - Suitable for scientific research laboratory use, especially for use with non-aggressive or concentrated solutions. - Can be used for sealing glass mouth, mouth, fish tank mouth, etc. Package list: test tube plugs