The Dert is a limited production aluminum yo-yo made by Russell Andert from Saint Louis. This yo-yo is slightly lighter and undersized when compared to other popular high end yo-yos on the market at the time of its release. The Dert is not made on a lathe, but rather machined on a CNC mill. The yo-yo was never intended to be made for mass production and likely never will be. The inner ring has a four percent slant to help with inner rim grinds. Russell Andert has been making yo-yos for a few years, but he would never play with them so he decided that he wanted to create a yo-yo that he would play with and that he could give out to other people. He designed the Dert as undersized and underweight, because his wrists hurt after yo-yoing with a heavier yo-yo. Russell's preferred setup for the response system is a silicone sticker.