Filler Needles. NMPA Certification. Parameters: Sterilization method is EO. Needle lengths range from 1.5mm to 50mm. Needle gauges and diameters: 34G (0.18), 33G (0.20), 32G (0.23), 31G (0.25), 30G (0.30), 29G (0.33), 28G (0.36), 27G (0.40), 26G (0.45), 25G (0.50), 24G (0.55), 23G (0.60).