These billet aluminum bottle brackets look great and are easy to use. The base area that holds the bottle is lined with nylon so your nitrous bottles do not get scratched and slide in place with ease. At the top of the bracket is a rubber O-ring style gasket to hold the bottle in place and prevent damage from occurring while mounting. The large knurled knob allows you to quickly secure or remove the bottle without tools. These brackets are light weight and come in at just over 3 pounds.