Hana ʻia nā kāʻei synchronous polyurethane me nā mea thermoplastic polyurethane (TPU) / cast polyurethane (CPU), me ke kūpaʻa kiʻekiʻe i ka abrasion, nā ʻano ʻano cores e hōʻoia i ka mālama ʻana i ka neʻe maikaʻi i ka hoʻouna ʻana, a he liʻiliʻi ka hoʻomanawanui ʻana o ka hana. I ka neʻe ʻana, ʻo nā niho o ke kāʻei me nā awāwa o nā pulleys e hoʻoneʻe i ka neʻe a me ka mana, ʻo ia ke ʻano o ka hoʻouna ʻana i ka meshing, a no laila ua loaʻa nā pono like ʻole o ka hoʻoili ʻana i ke kaʻa, ka hoʻoili kaulahao a me ka hoʻouna ʻana i ke kāʻei palahalaha. Hiki ke hana ʻia i loko o ke kāʻei hāmama, kāʻei apo spliced, kāʻei apo seamless me ka ʻole o ka interface.