This solid rod implosion marble is 1.52 inches in diameter. I started getting into making milli in the beginning of 2000 and this was one of my first attempts using a mold for the cog shape which reminds me a bit of the imperial symbol from Star Wars. Jet black and Star white are the main colors and I backed it with some tele-magenta from molten aura glass co. Comes with 3D printed marble stand and free shipping through the web site.