Especially useful for weavers who warp alone. It allows for the option of putting on more or less drag depending on the type of warp and the requirements. Note: The Tensioning Device is designed for weavers who prefer to warp from front to back. If you want perfect warp tension every time, this is the tool for you. "The greatest invention since the mute button." The tensioning device consists of: 4 wooden bars, 2 wooden holders, 2 clamps, and instructions on how to use it. These are available to custom fit any of our standard looms.