The shipping weight of the Oster jar bottom cap is 0.3 ounces and like the original part, this replacement Oster cap is made up of Bakelite. The product is a great replacement in unfortunate case of the original cap breaking down and has received the average rating of 4.3 starts from a total of 5 stars (based on Jan 2016) from its buyers. Most of the reviews say that it is a great fit for their blinders and fits their separate models perfectly. One of the buyer even commented “When you have an Oster appliance. And get an Oster replacement you know it will work”. Exactly what this review says, an Oster appliance needs an Oster replacement so this bottom cap is a right fit for your Oster blender jar.