This is a 2oz bottle of TTeam Losi Racing silicone shock oil. Losi shock oil is made from 100% pure silicone oil and will not thin out in hot weather or thicken up in cold weather. The higher the weight number of the oil, the thicker the oil is. Losi shock oil is generally slightly thicker than TTeam Associated shock oil with the same 'weight' rating. Please use the pull down menu to pick the oil weight.