Solid Rubber Stoppers, High Temp Soft Solid Silicone Rubber Seal Plugs Glass Dropper Bottle Cap Accessories 3.7 3.8 3.9 4.0 MM 4.0mm 4mm Hole (Color : Black Color, Size : 4mm-long-10PCS) (Color : Tra

Color: black, white,Material：SiliconePackage Include:Choose according to your needs!Note:Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.

• Feature: Well sealing , waterproof and dustproof.
• T shape Solid plug, good sealing , flexible and durable, not easy to crack, shrink, harden or break.
• if you need to seal watertight,the size can choose a little bigger, such as 4mm(5/32") hole can choose 4.4(11/64"),thanks!
• Temperature Range: -40ºC to + 240 ºC
• Premium material: these rubber grommet washers are made of excellent rubber material with uniform wall thickness, which have a strong tensile strength and good toughness, are robust and durable.