Product information "DONIC "Bluestorm Z1 Turbo"" DONIC BLUESTORM - A storm brews ! BLUE ALERT A comprehensively thinner top surface rubber, subjected to high tension, allows space for a thicker sponge - generating extra power and speed. The DONIC Bluestorm Series offers noticeably greater acceleration whilst retaining its outstanding spin and speed characteristics, making the latest trend.Select your own Bluestorm! DONIC Bluestorm Z1 Turbo: Power personified. A middle-pored sponge with a short wide pimpled structure. The Turbo has a 50° sponge and is therefore slightly harder than the standard Z1.DONIC has produced a more dynamic version of Z1 with Bluestorm Z1 Turbo. The sponge of Z1 Turbo is slightly harder but with the same middle pore size.An almost perfect combination with the very thin high-tension pimpled rubber and the highly valued dynamic blue sponge. The perfect weapon for uncompromising attackers.