Outer Collars - Zirconium, Inner Disc - Glow Resin, Stem - Zirconium. This one is 100% exotics, and as you can see, it lights up like a Christmas tree when you hit it with some light, and it keeps glowing afterwards! It lights up especially well with a UV light, but a bright flashlight will work good also. It is AWESOME to spin in the dark after you've got it charged! AMAZINGLY FUN TOP!! This was the first glow top offered through an open sale to the public. Prior to this there is only the Infected Specimen top that was done with some glow discs, but those were only sold through auction or sign-up sales, and they were very limited.