Serpent have brought out a ball-differential set for the 411. Featuring hard anodized aerospace aluminium diff shafts, this precision made diff pulley sports 14 balls for super smooth action. Soon Serpent will also bring out slipper-plates to turn this ball-diff into a slipper spool. Also for the Serpent 411 are these titanium nitrate coated pivot pins which help make the suspension parts works even smoother. Sold in a set of 2 for they are available in both front or rear versions.