The colored part is a ball-loaded stem, the clear part is the vape itself. Basically, you spin the vape over the flame as with a Dynavap, watching for signs of color/vapor, and then you hit it, then repeat. What's special about this v. the Roasty is that the parts are joined with a 14mm joint so you can just pop the vape half into your j-hook or waterpipe.
The stem is decorated with amber purple, I believe, and the effect is really cool: it looks basically amber but shifts subtly to purple hues and highlights as you move it. I've never seen that shift as plainly as with this piece.