Radha Krishna Sharma & Co. eyelets for the sympathetic strings. RKS sympathetic strings do not pass through the eyelets. RKS passes the sympathetic string through the neck and then the string lies over the top of the eyelet. These are known as taraf mogara. They are traditionally made of camel bone and are glued into holes on the front plate of the neck. They serve to keep the strings from biting into the wood front plate of the neck.
Approximate measurements are 1/8" diameter, 1/4" height Made in India