The 370 & 570 Retractable Wheels are great for adding some versatility to your tattoo furniture. They are landing gear style wheels and can be completely retracted to create a totally stationary tattoo chair. However, on the flip side, you can have a full set of wheels that can be lowered to create a moving chair. This accessory is a must if you prefer to have static furniture but sometimes have the need to move it around. The retractable wheels provide you with manoeuvrability and flexibility without changing any of the dimensions of the chair. Please not that these wheels are only compatible with purchases made after April 2009. If there are two visible plastic plugs at the top of the metal base then your furniture will be compatible with these wheels. However, if your base does not have these plugs you will need a retrofit kit in order to upgrade the chair to allow for compatibility with the wheels. This is a simple procedure and could make all the difference to your studio.