Ferrules for the Swix TBS poles. Triac Basket System (TBS) poles can only use these ferrules. The TBS poles have a tapered bottom on the shaft, and these are required to maintain pole strength. Threaded collar holds this ferrule tight to end of shaft. Regular shaft poles and Swix poles before TBS was launched can use the regular rollerski ferrules that we sell.
For sharpening, check out our high quality extra course file: https://www.rollerskishop.com/6-extra-course-ferrule-file/