faashadda isku-duuban ee laastikada ah ayaa inta badan loo adeegsadaa daaweynta, sidoo kale waxaa loo isticmaali karaa tartanka fardaha si looga fogaado dhaawaca lugta faraska. faashadda isku-duuban ee laastikada ah ayaa leh xabag gaar ah oo ku duuban faashadda, si sahal ah uga soo bax, sidoo kale si fudud ayay isugu dhegtaa, ma dhegto ama maqasho, uma baahna biinanka ama clips-yada faashad si loo daryeelo rabitaanka xayawaanka.

Cabbirka yar ee faashadda isku-duuban ee laastikada ah ayaa inta badan loo adeegsadaa xayawaanka yaryar, tusaale ahaan, 2.5cm ama 5cm waxay u fiican yihiin eyga, bisadda, iwm.

Cabbirka weyn ee faashadda isku-duuban ee laastikada ah ayaa inta badan loo adeegsadaa xayawaanka waaweyn, tusaale ahaan, 7.5cm ama 10cm waxay u fiican tahay lo’da, faraska, iwm.