These come pre-filled with oil, not sure what weight, but feels pretty lightweight. 2 of them had bubbles/air in them though from improper filling that you can see in the external reservoirs. They also do not come with bushings for the top mount hole. There are some extra plastic pieces that come in the parts bag for the Slash that fit in there and do work, although they are not a ball type swivel, just a cylinder bushing that only allows movement in 1 plane, so they can bind up if you tighten them up like normal. Have to leave them a little loose. Other than that they work well. Seeing the external piston working up and down is a neat touch.
