The prefilled syringe has many advantages

The left is the prefilled syringe，the right is the common。
First,I show the structure of the prefilled syringe as following:

The prefilled syringe has two types.The one has five parts tube,wide tip,dosing plunger,ring,seal,cap.
the other one has three parts tube,narrow tip,plunger,cap.
The tube is transparency,so the prefilled syringe can be fillede the medicine which need be keep in dark place.
The tip is not needle,so it don't damage the animals.
The dosing plunger and ring can ensure the precise dosage.So Don't inject over dose.
The cap can seal the tube,so the medicine is not oxidize by the air.