A, the coat is transparent, easy to observe the liquid level and bubbles. B, the product sealing is good, no leakage. C, sterile, non-toxic, no pyrogen. D, scale ink adhesion is strong, do not fall off, sharp and clear marking, in order to ensure accurate dose accuracy. E, Anti-slip structure, can prevent the core rod from accidentally sliding out of the coat. F. Dimensional accuracy to ensure leak-proof coordination. G. Needles and syringes are sterilized and individually packaged without any contaminating lubricant.