Stainless steel tubes with rounded ball tip for use in administering fluids and food to animals. Luer lock fittings suitable for most commonly used syringes. Cleaning: Wash in hot soapy water, rinse well and store dry. Sizes Available 8 Gauge: Length/ Internal Diameter- 150mm/4mm or 100mm/4mm 10 Gauge: Length/ Internal Diameter- 100mm/3mm 12 Gauge: Length/ Internal Diameter- 100mm/2.5mm 14 Gauge: Length/ Internal Diameter- 90mm/2.0mm 16 Gauge: Length/ Internal Diameter- 90mm/1.5mm 18 Gauge: Length/ Internal Diameter- 60mm/0.6mm For more Information on choosing the right size crop needle/medication tube please visit the vet-n-pet DIRECT Help Centre here.For more information on how to use a crop needle for administering medication or feeding please visit the vet-n-pet DIRECT Help Centre here.