I-Yan Yu No. 4, isithelo siyindilinga ngokuma, ingaphezulu licwile kancane. Isithelo esisodwa sinesisindo esingamagremu angu-200, kanti izithelo ezinkulu zinesisindo esingamagremu angu-250. Iwumplamu onenyama emhlophe onenyama eqinile nokunambitheka okumnandi nokucwebezelayo. Okuqukethwe okuqinile okuncibilikayo kungaba ngu-15%. Mayelana nekhwalithi, ayinayo ingqikithi, ikhiqiza kakhulu, inombala omkhulu wezimbali, iyazivundisa, futhi esifundeni sase-Zhengzhou, isithelo esivuthiwe sinesikhumba esibomvu ngokuphelele (esikhungweni sase-Xinxiang se-Zhengguo Research Institute). Isithelo esisodwa sinesisindo esingamagremu angu-200, kanti izithelo ezinkulu zinesisindo esingaphezu kwamagremu angu-300. Okuqukethwe okuqinile okuncibilikayo kungu-12.6% kuya ku-15.3%.