Description: HIGH QUALITY: The desk toy is a precision-machined tabletop toy that creates a captivating visual illusion when rotated. The solid body and smooth surface make it very pleasant to interact with it. UNIQUE DESIGN: Designed to spin on desk floor or any flat surface. Simply rotate it by hand to creates an almost magical effect that looks like continuously flowing helix would merge into a surface of tabletop. EASY TO PLAY: You may revolve it as a single unit or stack them together to make it more impressive, play with it at home, office, on the trip, on the plane, for fun. STRESS RELIEF: When revolving it creates a full body optical illusion. It's mainly suitable for creators, makers, thinkers, and anyone who wants to release their inner creativity and imagination. Also for fidgeting, anxiety, staying awake and other problems with attention disorders. NOVELTY GIFT: We believe our visual illusion ball can be a great New year gift, birthday gift or Other festival present. Specification: Material: Alloy Size: approx. Small: 38x34mm/1.5x1.34in. Large: 54x47mm/2.13x1.85in. Package Includes: 1 Piece Spinner Ball Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.