L Quantity (Optional): 4pcs/set (CPL/ND16/ND32/ND64), 6pcs/set (CPL/UV/ND8/ND16/ND32/ND64). For TRX4 SCX10 D90 1/10 RC Crawler Aluminum Alloy Steering Servo Link Linkage. ND4 reduces the intensity by two degree; ND8 reduces three.