ʻO ka wili wela wela e pili ana i ke kaomi ʻana i nā billet i ka mānoanoa o ke kila i makemake ʻia i nā wela kiʻekiʻe. I ka ʻōwili wela, ʻōwili ʻia ke kila ma hope o ka hoʻomehana ʻia ʻana i kahi kūlana plastik, a hiki ke hoʻoheheʻe ʻia ka ʻili. Loaʻa i nā wili ʻōwili wela ka nui o ka hoʻomanawanui a me ka ikaika haʻahaʻa a me ka paʻakikī, a kūpono i nā hale kūkulu, nā ʻāpana mechanical i ka hana ʻana, nā paipu a me nā ipu.