This is the loudest DESTO FORMULA rubber that DONIC has ever produced. DONIC DESTO F3 BigSlam reproduces the loud sound produced by speed gluing. The distinctive sound has been firmly and permanently incorporated into the rubber. BigSlam is somewhat softer, but not significantly slower than its successful sibling DESTO F3. It has the same amazingly simple ball control, but gives the same effect as optimum speed glue. Whether you prefer DESTO F3 or DESTO F3 BigSlam is a matter of taste or, should we say, of sound preference.