... pieces.Infusion 500 pieces/ box. Specification:Specifications Model: the intravenous needle:0.45 mm, 0.55 mm, 0.6 mm, 0 ... into the Infusion puncture the container, drain the bubble, the vein puncture, adjust theflow. This product can only gravity infusion.Notes ... free Safe, reliable, easy to use. infusion set with Butterfly needle