Organic Buffalo Bone Single Flare Plug with O-Ring Organic Buffalo Bone Single Flare Plug with O-Ring. A smooth, lightly glossy pure white plug this piece is minimalist yet striking. Available in 11 different sizes this plug is smooth and comfortable and comes with a Black O-Ring for security. Available in 11 sizes. Lightweight and comfortable to wear. Material : Organic Buffalo Bone Sold as Pair Exceptionally High Quality Jewelry!