Expensive and the snake is not working as you would expect. The plastic wire is weak, you can hardly push through the snake even on a tuning slide. On narrower turns it is almost impossible. Also the wood ball is so small that it stuck in water keys as well. Cleaning a leadpipe with this... I have almost broken the plastic wire because there are gum parts not just behind the ball but on the side as well, so it is not easily slicking but rather sticks to the pipe. Sure it cleans really well if you manage to pull through..
cleans well and easy to remove the dirt from the balls
weak plastic wire collapses when you push
small wood ball jams in water keys
hard to use even on big angles like a tuning slide