Ubu ni 4inches yikirahure hamwe nuburyo buvanze.Uyu ni umuyoboro wamaboko, urimo ibice bitatu byingenzi: umunwa, igikombe hamwe nigitoki.Umunwa urashobora kuguha aho uhumeka, kandi igikombe niho ushyira ibyatsi byumye.Biroroshye cyane gusukura nuburyo bwiza bwo guha inshuti cyangwa umuvandimwe nkimpano yo kwizihiza.Urashobora kuyijyana hanze, kuyikoresha murugendo, cyangwa ukagira ibihe byiza murugo.