Just received the racquet I ordered from Tennis Warehouse today. With it, I ordered the Babolat Custom Shock Dampeners. I've never used custom dampeners like these, let alone any dampeners. Please help me install/put on these things and what exactly they are. I have a red one that is simply circular. And I also have a black one with a round plastic-like insert with a bunch of metal balls in it. SOMEONE EXPLAIN/HELP!