Gauge Color O.D. Needle Length 28G Blue-green 0.36mm 13mm(1/2") 27G Grey 0.40mm 13mm(1/2") 26G Brown 0.45mm 16mm(5/8") 25G Orange 0.50mm 16mm(5/8") 24G Purple 0.55mm 19mm(3/4") 23G Blue 0.60mm 25mm(1") 22G Black 0.70mm 32mm(1 1/4") 21G Green 0.80mm 38mm(1 1/2") 20G Yellow 0.90mm 38mm(1 1/2") 19G Beige 1.00mm 38mm(1 1/2") 18G Pink 1.20mm 38mm(1 1/2") 16G White 1.60mm 38mm(1 1/2") If you are interested in any of our products, it will be our pleasure to receive your order list. Please contact E-mail:wu(at)anhuikangda(dot)com