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A comparison of a 30- and a 31-gauge needle showing the difference in... | Download Scientific Diagram
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Ultra-Fine Insulin Syringes 0.3 mL with Needles 8 mm x 31 gauge, 100/b — Mountainside Medical Equipment
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Insulin Syringe with Needle Ultra-Fine III 0.3 mL 31 Gauge 5/16 Inch Attached Needle Without Safety | ISO-MED, INC.
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Amazon.com: EasyTouch U-100 Insulin Syringe with Needle, 31G 0.3cc 5/16-Inch (8mm), Box of 100 : Industrial & Scientific
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