A study of half-sib progeny testing and selection was undertaken at the Central Experiment Station of the Rubber Research Institute of India during 1993-2004 to evolve new and improved rubber clones of varying parentage. A total of 150 rubber clones comprising open pollinated progenies of ten popular clones, with 15 clones per progeny were evaluated in a Compact Family Block Design over four years of tapping. There was significant variability among and within the mature progenies with respect to rubber yield, growth attributes, timber yield and bark anatomical parameters. Based on estimates of general combining ability for rubber and timber yield, clones PB 28/83, Ch 26, RRII 105, PB 215, PB 252, PB 217, PB 242 and PB 5/51 were identified as promising parent material for polycross breeding via polyclonal seed gardens. More than 50 per cent of the clones within the progeny of parent clone PB 28/83 were high yielding. This clone has also exhibited positive estimates of general combining ability for annual mean yield, summer yield and timber yield, comfirming its prepotent ability to produce superior progeny. From the present study, 29 promising clones derived from the half-sib progenies of eight parents of Malaysian and Indian origin could also be identified.