This is a small holder that is designed to hold a stainless steel mirror. You will need to purchase 4 of these parts in order to make a complete set. You will also need to purchase the size of stainless steel mirror you want for your horse:
https://www.mcmaster.com/9785K25/ I recommend stainless steel over all glass or plastic mirrors as stainless steel mirrors while optically inferior will not shatter if they are kicked or chewed on. These parts are normally supposed to be printed on a ordinary hobby printer but will be very luxurious out of a shapeways machine.
Purchasing through Shapeways does a lot to support my research and development of more parts, thus my prices here are considerably inflated to help cover the costs of CAD software, ordering test parts, and assisting veterinary patients in economic need from around the world.
All of the FuzNuz models are available for download for free for personal use both from Shapeways and
https://www.thingiverse.com/fuznuz/designs
FuzNuz is an unincorporated non-profit company located in Houston, Tx. Our mission is to utilize 3D printing to provide high quality horse equipment to impoverished areas both within the US and around the world, as well as expanding awareness of engineering best practices in the equine industry and reduce the cost of veterinary care.