This morning I got a PM related to hollow-weave Spectra. Since I wrote so much about it during the winter and spring, I thought I would post the question and answer along with my observations after several months of use. Have you used Cortland's C16 hollow-braid yet? I have a [12 strand] and really like it, just wish it was a little thinner. Also, have you had any problems casting or jigging with the hollow core lines? In the Tackle section I've made pretty extensive comments on my experience with hollow-weave Spectra but here are some mid-year observations of JB and Cortland hollow Spectra used on spinning reels. I've used the C16 braid. Like JB, it is very strong for its rating. Late last year I got a sample of JB 60# that broke between 67.5 and 70 lbs., as expected. This year I got samples of JB 60# and Cortland 80#. Both samples broke above 105 lbs. I decided to load four spinning reels with with JB 60# hollow and use Cortland C16 80# for making my new Wind-On leader design. You pay a little more for hollow-woven Spectra (which in truth is not hollow when you're using it, the inside fully closes) but after that, it is a "free lunch". Since you can splice it, I've found it MUCH stronger than other lines in actual use since there are no knots to fail. Other than that, I can't tell the difference. And just to be specific, because there are no knots it casts great. I've had no casting, wind-knot or other issues that have happened with the hollow-weave design--it just cost a little more to buy. One of the reasons that I chose the 60# JB is that it is 12 carrier. I didn't want the silky smoothness of 16 carrier and 12 carrier hollow-weave is a little less costly. (A note: all Spectra--hollow or solid weave--should be wound onto spinning reels under a lot of pressure, it casts much better when packed tightly. I used 12 lbs to start and tuna have now packed it to 18-30 lbs.) The size of Spectra lines are directly proportional to their strength. Most hollow-weave lines use more Spectra (for lines in the 60 to 130# range) to make them easier to splice. As a result, I have found them to be stronger and thicker than the package label. I got about 400-450 yards of 60# JB onto my Stella 20Ks and Penn 950 SSMs. That is consistent with PE8 or so. It breaks above 105 lbs. that too is consistent with PE8+ line. After using hollow-woven Spectra my thoughts are if you want strength for big fish, go with hollow-weave and eliminate the line-weakening, bad casting knots. If you want thin line, find a line of the thickness you want and test its strength. But make sure you can tie a strong enough knot for the drag you're using and for where the drag will get to during the fight, as line is pulled off. I hope this helps. After testing hollow for most of the last year and fishing it for the first half of the season, I found a lot of benefits, the only cost being the added purchase price.