Brass Tactile with Black Carb Infill Warning Composite Discrete $1.95 Tactile Systems Australia Warning Composite Discrete TGSI Brass with Carborundum infill are made from non-corrosive solid brass and high-grade Carborundum insert. Their robust construction, longevity and elegant aesthetics made them ideal for busy high traffic environments, whilst adding a sense of class to any design. Select options