Nice find - I have a few packs of those, they work great for 2-stage shorty models (Midget, Firefly), just chop off the top 1/2". I've never seen thick-walled in diamond tubes, if only you could figure out what's in the sealed boxes, they could be real collectors items!

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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org