Product Description Designed by KTS, the M4 Tenon Spinner is a linkage spinner where spinning the outer ring drives the inner ring in perfect synchrony. It features a mortise-and-tenon structure, inspired by traditional Chinese wooden architecture, creating a stable interlocking connection between components. Precision-crafted contact surfaces minimize friction, delivering extended rotation times and smooth spins. The subtle sound makes it office-friendly, combining elegant mechanics with quiet, enjoyable play. Specifications: Size: 35.7 x 35.7 x 18mm Weight: Titanium: 64.4g Bearing: R188+6703