Roj Hmab caij nplooj ntoos hlav: Nws yog ib hom polymeric elastomer uas muaj kev tiv thaiv kev vibration, me me resonance cheeb tsam, lub neej ntev kev pab cuam, tsis tshua muaj nqi thiab zoo txias kam rau ua, huab cua nruj, waterproof, hluav taws xob rwb thaiv tsev, thiab nws yog qhov zoo tshaj plaws xaiv rau txo kev co.