The Oil Slick Double Cog features a rapid spin, gentle vibration and subtle humming that are truely impressive. The cog can be rolled over hands and fingers, providing satisfying sensory input. With its compact size and quiet design, the Oil Slick Double cog is perfect for use in the workplace, during travel, or in the classroom, ensuring minimal disruptions to others. 

Please note that you may need to tighten the two flat metal parts up from time to time. If droppen when open, make sure you find any peices that may have fallen out, it will easily screw back together again. 

 * Not available in the black as pictured, metallic rainbow ‘oil slick’ only