This is a great pattern for our local fishery. They are tied with minimal weight, and have an awesome kicking action when stripped. If you get the timing right you can nearly make the tail hit the head. This gives a rise out of fish, and pushes them into a reaction bite.
You can fish these on sinking lines, intermediate lines, or just floating lines if you want to keep them way up in the water column.
This is the standard size that comes in at 6".