Positive plunger stop allows for maxiumum filling and eliminates costly spills. Tapered plunger shaft permits one-handed operation. Luer slip syringes allow for easy syringe removal from needle and easy needle replacement. Reinforced tip reduces breakage. Tri-seal o-ring reduces leakage and provides accuracy. Size is 20 Cc/50 Count. Dimensions are 5.75 X 11 X 5.75 UPC Code = 726087088891