Three out of the top four use a gut/luxilon hybrid: Fed: flexible control stick wilson nk 6one 95, wilson gut (made at same factory as vs) main/alu power rough 1.25mm 47/45 flexible control oriented stick 355-357g Nadal: Duralast painted to look like hurricane tour, apd, 332-334g 54-52lbs. 7 pts head heavy with 15 g at 12, and 5 g at butt cap. Murray: head tgk 238.1 flexible stick alu power main, vs gut cross 364g swing wt of 404g, head flexible control stick. Djokovic: head flexible control stick, vs main/alu power 1.25mm stick, 360g. 61.5/59.4lbs. Davydenko: 03, poly star energy Delpo: flexible control stick wilson nk 6one 95, alu power 1.25mm 62/62, 361g. Tsonga: babolat, hurricane tour black string, mass? tension? Simon: head flexible stick, head nylon, 55/53 Roddick: bablolat, hurricane tour/vs gut 62/62 monfils: prince, luxilon alu 1.25mm 57/55 Seems like the top pros use gut main/alu power cross with control sticks, flexible,with silicone injected into the handle, and lead under the headguards, around 360g.