The syringe is used primarily in head casting. The complex folds of the outer ear can be difficult to fill with alginate- unless you are using this handy little device.
The syringe has no needle- in fact the opening is about 1/8 inch in diameter so alginate can be expressed out of it quite easily. It is easily filled by removing the plunger and smooshing the alginate in and replacing the plunger. It is just as easily cleaned after use, so it can be used over and over.
The black rubber plunger can be lubricated with any silicone based lubricant (Armor All, etc.), but DO NOT USE VASELINE on it. The tip of the syringe can be cut shorter to make the opening larger if you prefer.