BRUSHOFF? is unlike any other sensor brush on the market. The BRUSHOFF design evolved from a NASA design and engineered to meet their rigorous requirements and specifications. It is not just an ordinary artist supply brush with a fancy name and high price tag ! Hold the BRUSHOFF and one instantly can see this is a solidly designed and built electronic tool utilizing science to produce unparalleled cleaning power ! Although the brush head is remarkably soft, the brush core is entirely electronically conductive, through an ingeniously designed grounding plug.