In-ears are the smallest type of headphones and are very popular due to their size, compactness, and flexibility. In-ears are available in different versions, for example as wired in-ears, neckband in-ears or true wireless earbuds. As the in-ear sits directly in the ear, both the front part, known as the eartips, and the housing are subject to a lot of strain. Excessive soiling can impair the sound if, for example, too much cerumen (earwax) builds up on the protective grille or in the ear tip.