The art and cosmetics industries also rely on plastic caps to package a wide assortment of products. Plastic glue caps can feature an attached brush or a closable seal, while makeup (from lipstick to eyeliner) is packaged with many varieties of custom and standard caps. Paint bottles, pens, and ink containers all utilize different sizes and shapes of plastic caps. Each industry demands different designs and qualities, and there are a surprising number of manufacturers able to meet the needs of these industries. http://www.led-tact-switch.com/plastic-product/plastic-cap/