In your rya rug making, this is an optional addition to your supplies.  It is very useful in keeping your needles organized. Everyone who has a Needle Organizer raves about it.  If you are handy with wood and drill, you can make your own.  The types of wood vary according to the types of good wood we find available when we make more blocks.  Currently we have maple and tulip poplar.  The cost per block is $19.