Bluefire M1 Turbo and Bluefire JP 01 Turbo: More explosive than ever! DONIC is proud to introduce two top quality Turbo rubber versions. Small changes to the structure of the sponge combined with a new pimple formation ensure that these Turbos have enhanced dynamic and spin qualities. Control: 6 Speed: 10++ Spin: 10+++ Sponge hardness: medium++ Sponge thickness: 1,8/2,0/max Top surface: spin-elastic - slightly harder sponge (50°) - increased dynamic - top surface rubber offers extra spin - superior version of M1 rubber For aggressive attacking players.