Kit includes plastic outserts, silicone piece to go under outserts, and felt for the side of the capo. This may also be added to our current original capo to convert the bar to an ETI bar by removing the tube and placing on the rubber strip and inserts.
We find it easiest to first put the inserts on the rubber strip and then slide them on the bar. Make sure the concave side is against the string. The rubber strip will compress and stretch, so it does take some adjusting to position the inserts so that they are even and secure over the strip.