The Harken Ball Bearing Block Set, introduced and class legal in 2010, is lighter, stronger, and offers less friction than the old style blocks. The set includes four blocks; the single and becket for the boom, and the two that make up the one piece traveler block.
Sold as a set (mainsheet & traveler) and are compatible with all ILCA dinghy boats.
Each of the blocks are also available separately elsewhere on this site.
LP Part # 91437