This is the Deconeedle from Mercado de Haciendo.
It comes in three sizes. XL for Rug Wool (16ply), Mini which is for about 4-8ply, and Ultra Mini which works with 4ply and under (chrochet thread, tapestry thread, embroidery thread).
I recommend using linen weave (particularly for the ultra mini) or monks cloth with this needle. I have yet to try the ultra mini on weavers cloth.
Each needle comes with two rubber washers that allow you to adjust the height of your loops. How cool is that! An adjustable needle that requires no threading!!
Personally i'm excited about these.
Not all of us can afford full sets of needles of all different pile heights. This is an excellent alternative.