Ka maikutlo a matle le a tsoelo-pele molemong oa bareki, k'hamphani ea rona e tsoela pele ho ntlafatsa boleng ba sehlahisoa sa rona ho fihlela litlhoko tsa bareki mme e shebane le polokeho, ts'epahalo, litlhoko tsa tikoloho le boqapi ba Mechini e Meng,
Ring ea Graphite,
Kobo ea Insulation,
Packing e hatisitsoeng, Hona joale re thehile likamano tse tsitsitseng le tse telele tsa khoebo le bareki ba tsoang Amerika Leboea, Europe Bophirimela, Afrika, Amerika Boroa, linaha le libaka tse fetang 60.
