Tired of scratching your nitrous bottle when it gets filled? ZEX has the perfect solution. These black velvet bottle bags are form-fitting, luxurious-quality, embroidered black velvet bags that slip over any 10 lb. nitrous bottle. They're thin enough to be kept on the bottle, even while the bottle is installed in the brackets. The black velvet used for these bags is of such high quality, that it makes the perfect finishing touch to your nitrous system installation. The bags also improve performance by insulating the nitrous bottle, which helps maintain bottle temperature for more consistent nitrous pressure and horsepower.