Generally, a syringe piston consists of a piston spring, an O-ring, a piston rod, a plastic rod, and a plastic piston. Its length, material, weight, color, and appearance vary depending on the manufacturer, but its basic morphological characteristics are as follows:
1. Length: The length of the syringe piston varies depending on the size of the syringe. Generally, larger syringes have longer pistons.
2. Appearance: Syringe pistons are generally cylindrical, and their surface usually has four holes to facilitate air entry and exit.
3. Material: Syringe pistons are generally made of polypropylene or polyethylene, and the outer layer is usually covered with a layer of polyethylene or polyurethane to enhance wear resistance.
