... is printed by indelible ink 3)Luer slip or luer lock 4)Easy to operate hypodermic syringe for single use, good ... size:1ml(40—100 unit),2ml,2.5ml,3ml(luer lock or luer slip fitting),10ml(luer slip or luer ... ),20ml(luer slip or luer lock fitting),30ml(luer slip or luer lock fitting),50ml(luer slip or luer lock fitting). medical supply/device