High-quality silica gel will not crack, shrink, harden or break, and it is non- and harmless and can be reused. Can withstand high temperatures up to 600 degrees Fahrenheit /315 degrees Celsius. Used to cover holes in powder spraying, painting, electroplating, and sandblasting. Widely used in architecture, electronics, automobiles, machinery workshops, laboratories, etc. Different colors different sizes, making it easy to grasp the correct size. Colour:As Shown Material:Silica gel Size:5pcs red 20x13mm, 5pcs blue 18x12mm, 5pcs black 16x10mm, 15pcs yellow 13x9mm, 20pcs rose red 14x8mm, 25pcs red 12x7mm, 25pcs transparent white 11x6mm Package Contents: 100 * Silicone Rubber Tapered Plugs Only the above package content, other products are not included. Note: Light reflection 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.