Kwallayen bearing abubuwa ne masu siffar ƙwallo da ake amfani da su wajen birgima bearings don rage gogayya tsakanin sassan da ke motsi, waɗanda aka saba yi daga ƙarfe mai tauri, yumbu, ko filastik. Manyan kayan sun haɗa da ƙarfen chrome na SAE 52100 don amfani gabaɗaya, ƙarfe mai bakin ƙarfe 440C don juriyar tsatsa, da kuma silicon nitride don aikace-aikacen sauri/haɗi. A samar da cikakkun ƙwallon bearings da ƙwallon Hollow.
