Prodigy Repeater Syringe features easy-to-use click, draw, and squeeze design. UV-resistant poly barrel and metal luer lock. Compatible with oil-based vaccines. Includes 3 colored knobs for easy identification. 25 ml adjusts from 0.5 to 2.5 ml in 0.5 ml increments; 50 ml adjusts from 1 to 5 ml in 1 ml increments.