It helps unspin the line as you reel back in. That way you have a nice clean spool when you're done.
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They look like really nice spools. The quality seems to be top notch and they do have a pretty sweet "bling" factor to them. We all know that one of the most important things about cave diving is looking cool.
The spools that Apeks gave us to give away at the workshop went very quickly. I'd be curious to see what the winners think of them after using them.
I use them for technical diving as backup with bag and/or lost in the wreck siltout safety spools.
Reason I like them is two fold...
durable and I can't break or bend them when a set of doubles impacts them on a boat or sat upon
secondly, the way they are cut and beveled it is VERY hard to get a dog clip to come open on accident in either direction of clip opening and I would rather spend a few more dollars on a reel than spend a lot more over time on lost reels and bags.
Cortland Line - link here
They come on ~500yard spools.
-Jon
It's Dacron, 0.095", 325# break strength. It's also bright yellow.