Ours came with the boat but are basically the same as home made. It is made of light line and knots. I think we have just three lines at the boom and there are small kringles in the mainsail for them to pass through. They are tied on with bowlines in similar fashion to reefing lines. The only drawback is that the full battens can get snagged in them on the way up and the sail can flop down off the boom a bit aft of the last one. They stow neatly along the boom when sailing. Simple and effective.