The "One Star" horn claws have a bone star on each end. These don't come with o-rings and you shouldn't need any because the ends are slightly bigger than the gauge.
All gauges have about a 1" diameter. A bit smaller on the smaller gauges and a bit larger on the larger gauges.
IMPORTANT POINTS ABOUT THIS JEWELRY, PLEASE READ.
Organic body jewelry is hand made of natural materials, so gauge, length, color and design may vary. For colored glass and non-opaque stone, smaller gauges are often lighter in color. Such differences are NOT considered a defect.
For items that come in pairs, you can expect that you will receive a pair of jewelry (including each individual piece within the pair) that is within .5 mm of stated size for jewelry up to 1/2" (12.5 mm) and within 1mm of stated size for jewelry larger than 1/2". If you receive a pair that is not an EXACT match, please know that is the best matched pair available.
Jewelry is extremely delicate, especially in smaller gauges. Your breaking it does NOT make it defective.
Jewelry is not to be worn while sleeping, bathing, or playing sports.
Jewelry is intended for completely healed piercings.
Other than labret styles, jewelry is not intended to be worn in a mucus membrane.