The 16 or 20mm size is ideal for rocking horses. All sizes can be used on a wide range of toys.
Each has a 1/4" diameter by 3/8" long stem (with lock washer) for post mounting or the post can be clipped for countersunk installation. There is a molding spine mark on the rim of each eye.
The 16mm (5/8") Plastic Eyes are no longer available.