Fit Luer-lock and slip tip syringes. Sterile, disposable needles are made from stainless steel and provide superior sharpness. The siliconized cannulae reduce resistance and maintain speed and smoothness throughout the injection. A sheath protects the point and cannula. Lot control number on package indicates complete sterility. Needles are packaged in strips of five.General Guide for the Most Popular Sizes:(please note this is a general guide only. Please refer to your veterinarians instructions as to the correct size needle to select for specific applications):18G x 1 1/2" is a common size for intramuscular and intravenous injections of antibiotics and higher volume medications, including injectable vitamins and other supplements for horses, cattle and sheep.21G x 1 1/2" is a common size for intramuscular injection of vaccinations and low volume medications as well as injectable vitamins that are of low viscosity for horses, cattle and sheep.22G x 3/4" is a common size for intramuscular, intravenous and subcutaneous administration of medications and other preparations for dogs.All needles are available in strips of 5 or in boxes of 100.