Yonex rate their badminton strings in 5 categories, namely, repulsion power(RP), sound(S), shock absorption(SA), control(C) and durability(D). Based on what I could gather from various sources, this is how Yonex rate all their strings: 1. BG65 : RP=4, S=6, SA=5, C=6, D=8 2. BG65 Power : RP=7, S=7, SA=6, C=6, D=8 3. BG66 : RP=8, S=7, SA=6.5, C=7, D=5 4. BG85 : RP=8, S=8, SA=7, C=7, D=6 5. BG65Ti : RP=7, S=7, SA=7, C=6, D=7 6. BG68Ti : RP=9, S=8, SA=6.5, C=7, D=6 7. BG75Ti : RP=8, S=7, SA=5, C=6, D=8 8. BG88Ti : RP=7, S=7, SA=6, C=8, D=6 9. BG33 Tournament(200m) : RP=9, S=8, SA=6.5, C=7, D=6 10. Cyber Natural : RP=8, S=6, SA=8.5, C=10, D=6 Does it make any sense? I would think so. The BG33 tourney grade comes in only 200m roll and looks suspiciously like the BG68Ti. Although the above comparative ratings do somewhat square with my own experiences, I do not claim to have tried all of them.