If you order this product, you will receive one holder.
You should protect the holder from direct sunlight, if possible.
Vacuum Holder 4 Pigs is ideal for practicing, demonstrating, and simulating operations such as LASIK, Epi-LASIK, LASEK, and especially for research tasks. The vacuum holder is adaptable to function with all microkeratomes and lasers and is easy to use. The primary function of holding the pig eye through a vacuum is widely used and works well. We sold hundreds of these fixtures under the trade name MTS vacuum holder. This is also why we decided to reinvent the system to share our experience with this new holder. Through our new design, the internal pressure is decreased tremendously, and therefore the structure and the shape of the eye remain intact.
Also, you get a better grip and a more extended hold of the big eye if you are toning the eye with a 30G needle and lubricate the eye for a long vacuum period.