Spacers are used for adjusting tension between your camber and sail batten. Simply remove the camber and slide one or more spacers on your batten and replace the camber to obtain perfect tension and rotation. This item is available ony per piece. Spacers are available for different sail seasons, so please contact us before ordering and tell us which for which type and year of sail you would need the spacers so that we can make sure you receive the right type of spacers for your sail! A spacer set for Koncept would be 4 spacers; for KA.Race it would be 6 spacers.