Ihe nchekwa nchekwa ntu a mara mma, enwere ike ibugharị ma dịkwa irè, ọ nwere ike ichekwa, chekwaa ma bufee ntu ntu gị dị oke ọnụ ahịa, ngwa ntu na ihe ndị ọzọ. Akpa uwe ntu a mara mma nwere trays 6 na nnukwu ụlọ 1, nke zuru oke maka mkpa ebe obibi gị.
Akpa kechiomaụlọ ọrụ mmepụta ihe nwere ahụmahụ 16+ afọ, ọkachamara na mmepụta nke ngwaahịa ahaziri iche dị ka akpa etemeete, ikpe etemeete, ikpe aluminom, ikpe ụgbọ elu, wdg.