From Tamiya:
Used instead of the package normal gear differential, this product is especially helpful on the rear, giving steady grip. Holes for the 3mm balls are designed to assist preserve them nicely greased. Contains 39T ring gear, bevel pinion gears, diff joints, balls, plus 850 and 1280 measurement ball bearings. The picture at proper exhibits an assembled instance.
Set contains differential joint A, differential joint B, joint cup, ball differential ring gear (39T), bevel pinion gear (for 39T), 3mm 1/16 inch metal ball, 850/1280 bearing, and so forth.
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