Sunrace STR91 STI 9x2v.Road bike shift and brake lever, compatible with Shimano.Push Push Shifter Design, 2:1.Actuation ratio, 9 speeds for the shift lever.Left shifter operates a dual front derailleur.Brake lever:Forged aluminum.For handlebar diameters from 23.8 to 24.2mm.Weight according to manufacturer:418g (pair)