The smaller the gauge of the needle, the larger the diameter.Please refer to the chart below for syringes with needles: #168Monoject3cc25 gauge5/8" needleKitten and Puppy #4854Monoject3cc25 gauge5/8" needleKitten and Puppy#9Economy3cc22 gauge3/4" needleCat and Dog #4853Economy3cc22 gauge3/4" needleCat and Dog#159Monoject3cc22 gauge3/4" needleCat and Dog #4855Monoject3cc22 gauge3/4" needleCat and Dog#50438Monoject3cc22 gauge1" needleDog #167Monoject3cc20 gauge1-1/2" needleHorses#4856Monoject3cc20 gauge1-1/2" needleHorsesNew York Residents: If you wish to purchase syringes and/or needles your order must be accompanied with a State "Certificate of Need" or a prescription from your veterinarian. In New York state, obtain a certificate by writing:New York State Department of HealthBureau Controlled Substances433 River Street, 5th FloorTroy, NY 12180Residents of CT, DE, IL, NJ, or NY, please ask your veterinarian for a prescription to purchase needles and syringes. Any licensed veterinarian can provide you with a prescription. The easiest way to get a prescription filled is to ask your veterinarian to call us at 1-800-447-3021 or Fax to 800-447-2404 with the prescription information.

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