Vibrata Chromodoris says:
These are permanent human hair extenders - a full 9 inches added to my 34 natural shoulder-length dreads. (see before pic here)

I bought plain black human hair and a some perm solution and when i got it home I went right to it. I tried gluing loose hair in and it was instantly a write-off - looked like someone spunked on my dread.

So I decide to pre-make the extenders. I dreaded one up, rubber banded it to one of my natural dreads and used a tiny crochet hook to knit the loose hairs together - sort of like the latch hook method of embedding loose hair into dreaded hair. After about 20 minutes I had a perfect dread, no trace of where the two ends meet, and no glue!

The joint is so firm I can yank really hard and it doesn't budge

Step-by-step:

1: Here's the real dread (top) split open at the end and the new dread extender (bottom) with the top split open.	2: The two ends are rubber banded together with the loose hairs overlapping the dreaded parts.	3: Here's the end of my little crochet hook jammed into the bottom dread

4: Now I simply start grabbing loose hairs and yanking them through the dread, pulling them all the way through and repeating until no loose hairs are sticking out.	5: After about 20 minutes (or longer) of fiddling and cursing, here's the finished extended dread! The wire wrap/bead thingie is about two inches above the joint.	6: Here's a shot of the very first one I did...very hard to tell where the two pieces joined...