The patina finish in this kitchen copper sink is a smooth light brown, it has a standard 3.75 diameter opening,which fits 3.5" disposer drain assemblies. This model has one single rectangular bowl with inside dimensions of 17" x 11" x 8".The copper sheet is 14 gauge (0.064" thickness). From a copper sheet the wise artisan hands transform it into this unique piece where the hammer footprint is very visible, giving it its own character. The border around the four sides of the sink is 2.5".The techniques used by Santa Clara del Cobre craftsmen is the same one used for several centuries, where no sophisticated tools are used, just the furnace to heat the copper and a hammer to give it the shape. The finish is in a smooth light brown color, a more uniform looking then the antique looking one. Along your home decoration, this piece it will add a unique touch to your kitchen making it a very special point of attraction.This copper sink will not rust or become greenish because the patina will protect it from humidity and oxidation, just keep it as dry as you can to preserve it longer with the current color textures. The patina can be damaged faster if any abrasive substances stay for long periods of time on the sink surface, because of this, washing it after usage is recommended; besides that, no more maintenance is required."