This top is turned from 1.5" Nickel Sliver and fitted with a 1/4" alumina oxide bearing. The stem is hollowed through to the bearing. This top has a low clearance, but it does not take much of a spin to get a smooth spin. Been spun a few times, but in excellent condition. My best time was 10:06. She develops a light flutter about 2-3 mins in which slowly magnifies as it looses momentum, but spins strong until the end. Asking $80 shipped CONUS, international extra. TitanWorks .94" Devin Thomas Banded Ladder and Zirconium with 1/16" ceramic bearing. She's been spun and much enjoyed, and still rocks smooth 8-9 min average runs, YMMV. Has some surface rust forming near the stem on both top and bottom, but should be easily cleaned up with the usual EDC cleaner/protectant. No COA card included, never came with one. Asking $125 shipped CONUS, international extra.