... 2:Certificate of CE,CSA,SASO 3:Factory price anti-static brush:large anti-static brush Brush handle Material: carbon fiber composite ... : 1X11, 1X12, 1X11 (34 Trichodesmium) Surface (volume) resistance: 106 ~ 8First, anti-static brushes this product uses the carbon fiber composite plastics ... dirt, static electricity can be generated with the earth leakage. anti-static brush