Enwere ngụkọta nke ibe asatọ ebipụtara, yana enwere ebe zuru oke iji kọwaa ngwaahịa gị iji bulie ahịa gị, a na-ejikwa ya n'ọtụtụ nkwalite ngwaahịa ahịa zuru ụwa ọnụ. A na-egosipụta ozi ngwaahịa kpamkpam. Mee ka ndị ahịa gị mara maka ngwaahịa gị.
Akwụkwọ kraft octagonal mechiri ewepụghị akpa zipa ala. Iji akwụkwọ kraft mee ihe nwere ike ịgbatị ndụ ndụ nke nri ma lelee ọkwa dị elu.