Features: *The friction surface of the carbon brush must be in full contact with the friction surface of the rotating part, so that the current transmission is uniform. *The sparks appear after the new carbon brush is installed. Start the motor and run it without load. Leave it for 2-3 minutes and the sparks will disappear naturally. *Pay attention to whether the copper wire fixing bolts are firm and whether the fixing method prevents the use of carbon brushes. *Pay attention to whether the spring pressure is good during installation and whether it does not hinder the use of carbon brushes. *There should be no oil stains or oil stains on the friction surface of the carbon brush and rotating parts. Specifications: *Material: Carbon, Metal. *Color: As pictures shown. *Thickness: approx. 6 mm *Width: approx. 9 mm *Length: approx. 13 mm *Compatibility List: GA4034, GA4530, GA5434, GA4534, GA5034, GA5030, JS1601, JS1000, PJ7000, TM3000C *Quantity: 4 pieces Package Included: 4 x CB459 Carbon Brushes