50ml Replacement Barrel w/ O-Ring

50 cc syringe accurately delivers a pre-selected dose ranging from 1 to 5 mL. 25 cc syringe ranges from 0.5 - 2.5 mL in 0.5 mLincrements. Chrome Metal and Lexan construction. Special locking mechanism prevents air or contaminants from entering the syringe and a grip delivers medication when pressure is applied to the back of the grip, which gives a more natural motion when giving injections. Color coded knobs let you assign specific syringes to a specific vaccine or antibiotic. Colored knobs help to avoid mistakes when using more than one syringe at a time.