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Amazon.com: BH Supplies Insulin Pen Needles 31 Gauge - 5/16", 8mm (Pack of 125) : Health & Household
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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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China Factory Hilos Mesotherapy Needle 31g 12mm - China Mesotherapy Needles Injection, Disposable Needles | Made-in-China.com
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