This disk measures 5/8" diameter and has an arrow in the center that spins. The left and righ side of the disk is marked False and True is in the up and down position. The arrow spins freely and the disk is marked Lie Detector under the upper True word. It isnt marked but has been tested and is guaranteed sterling. Please take a look at my other items. I will be listing lots of charms and will gladly combine shipping. I ship to US only and will ship within 24 hrs of payment. Please pay within three days. Thanks for stopping by!