Syringes for insulin users are designed for standard U-40 and U-100 insulin. • Fine gauge needles, for less pain: 29G, 30G and 31G. • Short needles, as insulin injections are subcutaneous (under the skin) rather than intramuscular. • Markings in insulin units to simplify drawing a measured dose of insulin. • Sterile, One time use only. • Delivered in standard boxes of 100pcs. Available in boxes of other size upon request. • OEM packaging available.