Replacement wick set Comes in a 5-pack, with measurements of 5.40in length x 0.25in width x 0.25in height | Replacement wicks keep Crane travel humidifiers operating at their best and prolong their use | Wicks absorb water and filter Out dissolved minerals and bacteria, preventing white dust | Wicks are easy and convenient to carry thanks to their compact size | Wicks change color when they're ready to be replaced: just remove the wick from the base, Twist it, pull it Out, slide in a replacement wick, and then Twist it to ensure it's securely in place