5ml syringe. Oring syringes are the perfect solution for hand feeding baby birds and other animals. The oring plunger makes for smooth feeding with good control without sticking after a few usesl. This slip tip syringe will hold a catac ST1 nipple, the silicone nipple and a cannula tip. Note: Always use caution when feeding animals with a nipple and syringe that the animal does not ingest the nipple. This could result in death. Sterile packed and BPA free.