It's the replacement quads that were hard to find when I last looked. Picked up a pack of five for $20 from my local smoke shop guy. They last a while. Haven't tried yet but I think they can be cleaned in alcohol (but check on that first).Came with a spare quad, nice smooth rig.
This rigg is my goto when I don't feel like taking out the dab gear or when it's not possible to use. Not a powerhouse like a dabber but it'll pull some massive ripps.
(The neck band thing that comes with it is great if your wandering around and want quick access.)