Horse Bits Rainbow Thin Mouth Joint Flat Ring Eggbutt Snaffle Bit Sizes: 10 CM 11 CM 12 CM 13 CM The eggbutt snaffle has fixed, oval shaped rings offering a consistent contact. Offers a lighter feel in the mouth for horses who are more sensitive. The single joint applies a nutcracker action which applies pressure to the tongue, the bars of the mouth and the horse's palate.