Hybrid replacement shaft questions

Hey Everyone! I'm looking at replacing the stock Cobra Shafts on my Bio Cell Hybrids, and possibly the RIP Shaft on my Amp Hybrid. I found a seller on eBay selling these MR Kuro Kage shafts:http://www.ebay.com/itm/28179277613...49&var=580789301113&ssPageName=STRK:MEBIDX:IT

Since these are labeled as Iron shafts, would they be usable in my hybrids, or will the flex, torque, and weight differences cause issues, vs. getting true hybrid shafts? I've seen these 80g shafts marketed as Iron/Hybrid shafts, so that's where my confusion comes in. For reference my RIP shaft is a 70g shaft and my Cobra shafts are 63g. Thanks for any insights and wisdom!

As long as the hosel size in your hybrids is .370, these should be perfectly fine in your hybrids.

I am pretty sure it's more marketing than any other difference.
Check weight, length, tip size, flex, torque and trim instructions then compare to "hybrid" marketed version.
After all hybrids are made to replace irons.