Flat top rubbers are designed to fit the Sorbo system. BlackDiamond SQUEEGEE RUBBER is formulated from the highest grade of squeegee rubber materials – using carbon impregnated natural rubber from the rubber tree plantations of Malaysia. BlackDiamond has the reputation for THE SHARPEST EDGE, because we supply two rubbers together – and you, the user, peel them apart to make the edge for the first time. Our unique formulation and molding method delivers a much thinner ‘outer layer’ of shiny rubber, meaning it takes LESS TIME to wear it in and you have the soft rubber inner material on the glass, meaning a better and faster clean.