Medical Disposable Insulin Pen Needle with 4mm 5mm 6mm 8mm Needle Length - China Medical Equipment, Diabetic Insulin Pen Needle | Made-in-China.com
Stainless Steel BD Ultra Fine III Shortest Pen Needle, Size: 32 guage (thickness)
UltiCare® Insulin Pen Needle, 31G x 5/16" - DDP Medical Supply
Evaluating the User Performance and Experience with a Re-Engineered 4 mm × 32G Pen Needle: A Randomized Trial with Similar Length/Gauge Needles | Diabetes Therapy