this instrument is famous for its loud and rigid sound. a chenda has two sides, the left side called "edamthala" (ഇടം തല)(left head) and the right side "valamthala" (വലം തല)(right head). the "edamthala" is made of only one/two layer of cow skin and the "valamthala" will have a five/seven layer skin, so as to have a bass sound. the skin are dried in the shade and fastened on wooden rings (chenda vattam, ചെണ്ട വട്ടം) made of the trunk of a locally available palm tree (eeranpana) or bamboo, using a gum prepared from the seed of a tree called "pananchi maram". the circular frame is kept in a vessel, boiled for an entire day and then bent in the form of circle and dried. the body of the chenda which is 1 ft in diameter and 1.5 inches thickness is made of the soft wood of the jackfruit tree (വരിക്ക പ്ലാവ്) (varikka plavu). the thickness is again reduced by 0.25 inches, at simultaneous points separated by 4 inches. this is done in order to produce highly resonating sound. only the wooden rings with the skin (chenda vattam) is replaced once the quality of the sound is not up to the mark. for regular chenda artists an average of 15 rings are required every year.