COPPA JO GOLD - sets a standard with the in-built speed glueing effect. The sound and feel is similar to speed glueing, giving a performance one can only dream about. We recommend the Coppa rubbers from Jan Ove Waldner for the following players: Coppa JO GOLD is the highest performing rubber from the FORMULA series and a replacement for speed glueing. This high performance rubber is suitable for highly trained attackers with good technical know-how.