Soooo yeah, the pics pretty much speak for themselves here! This is one of the greatest marbles Kaj has ever made, a huge example of his Wonkastone chip stackers, and it is staggeringly cool!! It's got the UV core like they all do, but it ALSO has crushed opal in the core, and as you spin it around with a light on it you can see those opals sparkling through the clear holes throughout. You can see that opal sparkle on each pole as well in the pics, sooo much cooler in hand! This is an absolutely legendary marble, so dang hard to let go of, I love this piece SO much!! Signed 'Kaj'.