Taylor Made Rossa CGB Fontana 7 Putter. TayorMade Rossa CGB putters are engineered with an exceptionally deep centre of gravity (CGB stands for Centre of gravity back). The first key CGB putter improvement involves the dramatic expansion of Rossa's Titallium face insert, renowned for its remarkable feel, to 43% larger than previously used. This larger insert offers two significant benefits. One, because Titallium is so much lighter than steel, the larger insert allowed Rossa engineers to reallocate 43 grams normally positioned in the face into the back of the putterhead, moving the CG back. Two, this larger insert delivers improved feel at impact than the previous Rossa Sport model. The second key CGB putter improvement came in the form of four tungsten CG rods inserted into the rear side of each blade, and two tungsten CG plugs inserted into the sole of each mallet. These CG rods and CG plugs serve to concentrate weight into strategic areas that helps to shift the CG even farther down and toward the back of the putterhead.