ʻO nā pōpō bearing he mau mea poepoe i hoʻohana ʻia i nā bearings ʻōwili e hōʻemi i ka friction ma waena o nā ʻāpana neʻe, i hana pinepine ʻia mai ke kila paʻakikī kiʻekiʻe, ka seramika, a i ʻole ka plastic. ʻO nā mea nui e komo pū me ke kila chrome SAE 52100 no ka hoʻohana maʻamau, ke kila kila 440C no ke kūpaʻa ʻana i ka corrosion, a me ka silicon nitride no nā noi wikiwiki/hybrid. Hāʻawi i nā pōpō bearing piha a me nā pōpō Hollow.
