This is a replacement Traxxas Center Driveshaft Set. This set includes the front and rear center driveshaft. These units come partially assembled with installed rubber boots for long life and good performance.
These driveshafts are for use with the current model E-Maxx. For center driveshafts for the first generation E-Maxx (TRA3906) with the black chassis, see part TRA4951R