Concentric - Symmetric Casing system yakakosha kudhiraivha uye kuisa gomba panguva imwe chete kuburikidza nekusagadzikana kwepasi mamiriro.Mutyairi bhiti akasanganisirwa nemhete inogutsa kana kuti inogona kushandiswazve mhete inoita yakazara kumeso musoro dhizaini inovandudza zvakanyanya mwero wekupinda uye kutwasuka kwegomba rekuchera.Iyo yemukati yekutsvaira grooves pamwe chete neyakavakwa-mu casing shangu inopa chisimbiso chakanaka kune bhatani regomba rekuchera, uye nekudaro kuderedza kukanganiswa kwekupoterera kwegomba rekuchera.