FLOAT BLACK RUBBER 8"x4"x5/8". The black Kraft Tools sponge molded rubber pad is perfectly cemented to the back of the flat aluminum. Although the base is lightweight, aluminum is strong for use on all sand surfaces. Its material is designed to smooth plaster and concrete surface applications. It also has a firm rubber that opens plaster and plaster to allow them to breathe, thus preventing cracking. Its plastic handle is well balanced for a comfortable grip.