Bronze copper sink installation silicone tube by Premier cooper products is a natural cure silicone made without chemicals what may react with the copper and cause discoloration, The silicone adheres and seals with a seamless look that matches the copper finish perfectly, It can be used for a surface mounted copper sink, copper bathtub, under mount installation and seals the gap between the copper sink and the counter, Material: Rubber, Color: Black, SKU: PRMCP015