He tapatoru auau, tapawhā, tapatoru, tapatoru convex, porowhita me te rhombus.Ko te diameter o te porowhita kua tuhia o te mata mata ko te tawhā taketake o te mata, a ko tona rahi (mm) raupapa he 5.56, 6.35, 9.52, 12.70, 15.88, 19.05, 25.4….Ko etahi he kohao kei waenganui, ko etahi kaore;ko etahi karekau, rereke ranei nga koki awhina;ko etahi kaore he pakaru maramara, ko etahi he pakaru maramara ki tetahi taha e rua ranei.