This is the replacement Knuckle Set for the Duratrax Mini Quake 4WD. FEATURES: Composite nylon construction, black in color INCLUDES: Two left knuckles (key number 23, step 19 in the manual) Two right knuckles (key number 24, step 18 in the manual) REQUIRES: Mounting to the model following manual COMMENTS: For the graphite verison of this item, order DTXC8228 For the 6x10mm bearings used in these knuckles, order stock number DTXC1561 For the 3.8mm threaded balls used on this part, order stock number DTXC6261 kpm11/23/2004 ir/jxs