The kinetic desk toy is a precision-machined tabletop toy that creates a captivating visual illusion when rotated. It can be rotated on any desktop or flat surface. The solid body and smooth surface make it very pleasant to interact with it. HIGH QUALITY: The material is made of sturdy stainless steel. A precision machined metal globe, a piece of kinetic art that invites you to transform it from precisely engineered still shape into hypnotic optical illusion. When revolving it creates a mind-bending 360optical illusion of continuously flowing helix that looks like would merge into a surface of tabletop. EASY TO PLAY: Simply set it on any flat surface (like as desktop) and give it a spin, either clockwise or counterclockwise. The spin creates the optical illusion that the groove, or line, is moving up or down, depending on which way you spun it. You may revolve it as a single unit or stack them together to make it more impressive. PERFECT GIFT: Ideal for creators, thinkers and anyone who wants to release inner creativity and imagination. Stay focused, relieve stress or relax during working hours or brainstorming sessions. In addition, it also suitable for people with fidgety hands, autism, depression, anxiety, ADHD, staying awake and other attention disorder issues, like nail biting, insomnia, smoking, leg shaking, etc. TIPS: Do not spin too fast, the optimal rotation time is about 20-40 seconds, and you will enjoy the best optical illusion. TIPS: Do not spin too fast, the optimal rotation time is about 20-40 seconds, and you will enjoy the best optical illusion. Max rotation time is more than 120 seconds. NOTE: This is NOT a toy for child. Suitable for ages 16 or up. Safety Warning This is NOT a toy for child. Suitable for ages 16 or up. Size: 1: diameter 40 mm, 2: diameter 45 mm Color: 1: silver, 2: blue, 3: black, 4: gold, 5: rose gold Package includes: 1pc * fingertip gyro