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One eye from 4mm to 18mm. Print two if you want both eyes. I recommend using the detail plastic so that the eye is as smooth as possible. You can use this product by printing from here and making a mold of the eye. There is a small divot at the center of each eye. Once you have made a mold and cast in resin, make a pupil by using the divot as a center for a small drill bit in the size you would like the pupil to be. Gently twist the drill bit by hand to create the pupil. Paint and enjoy. You can also print irises, seal them, and place in the eye. You are welcome to sell eyes you make from this.