Chicken Skull with Sclerotic Rings for sale! You will receive the Chicken Skull with Sclerotic Rings pictured. The Sclerotic Ring is a ring of bone found inside the eyeball of some animals! We have processed this ring and attached it to the skull with a small white wire that runs through the center of the skull. Please refer to the photos! Length 3'' Width 1'' Height 1.25'' Please note, there is a very small amount of damage near the base of the skull which has been repaired, this is visible in the photos and reflected in the price.