They are called Smovey Vibroswing. I have been asked by a friend to explore options for making something similar to these to use in a professional setting with older adults and/or children and adolescents. Two sets would be ideal. These can be found on ebay for $165 or higher. In essence they are some type of plastic corrugated tubing with ball bearings inside (see pic) and a cushioned grip that allows the user to experience a sensation/vibration when moved. I have looked online and was unable to locate alternatives to the the original version. Thanks in advance for sharing your knowledge and thoughts.