Igufwa ryumutaka ryerekeza kuri skeleti kugirango ishyigikire umutaka, igufwa ryambere ryumutaka ni igiti, igufwa ryumutiba, noneho hariho igufwa ryicyuma, igufwa ryibyuma, igufwa rya aluminiyumu (nanone bizwi ku izina rya Fibre bone), igufwa ryamashanyarazi nigufwa rya resin, bigaragara cyane muri ...
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