Usoro nleba anya nke nkọwa dị elu: 4mm, 6mm, 8mm, 12mm, 16mm multiple nhọrọ, ogo onyonyo dị elu, mee ka ndụ gị dịkwuo nchebe na enweghị nchekasị.
Anyị nwere nnukwu ahịa ahịa na ahịa ndị China, ma na-ere nke ọma na India, United States, wdg. Anyị na-atụ anya ịkwado gị, nweere onwe gị ịkpọtụrụ anyị, daalụ maka nkwado gị.