They are commonly applied to protect the ports of the computers and the laptops. These computer port anti-dust plugs are made of high quality PE. Dust plugs are durable and perfect for protecting computer ports from dust, liquid and oxidation rust. So, they keep the ports of the computer and the laptop clean and durable. Features: dust-proof and moisture-proof, data security protection, detachable for use. Color: black, transparent color Material: PE Package Contents: 40 x USB Dust Plug 4 x key 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.