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As this one is designed to meet the expectations of professional players – this means the sponge of the Coppa J.O. Gold is relatively hard – we have developed also a softer version the COPPA JO SILVER. This is a rubber that most players feel very comfortable with, especially European players. COPPA J.O. SILVER is considerably softer, but due to its high built-in speed-glue effect, it plays like a medium-hard speed-glued rubber. DONIC COPPA JO SILVER is the star of the new generation of rubber. It combines excellent control, very high speed, and spin that is very close to that of professional speed-glued rubber sheets.