Phofo ea khetla e bolela phofo e entsoeng ka ho sila le ho sila likhetla. 95% ea metsoako ea eona ke calcium carbonate, chitin, le palo e nyane ea li-amino acid le li-polysaccharides. E ka sebelisoa e le thepa ea maemo a holimo bakeng sa lijo, litlolo le mekhabiso ea kahare, 'me e sebelisoa liphoofolong le likhoho. Lijo le lijo tse ling tse eketsang mohloli oa calcium, ts'ebetso ea mabenyane, litlolo tse qhibilihisang, jj.