... laser diode,optical glass lens, driver circuit and housingBetter line qualityHigh reliability, high stability, long life,low price ... laser modules ,like as dot ,line /cross line laser module,DPSS laser,uniformline laser,single longitudinal mode green laserbeam expander ... module.Shape of light: dot, single line,cross line ,collimated expanded beamwidth and length of line or diameter of spot : can ...