REACTORRIM is a method of stimulation of Hevea trees by slow release of gaseous stimulant that continuously diffuses into the laticiferous system. It has undergone numerous stages of development and improvement through a continuous process of research and development. Currently, the stimulant gas is compressed in a canister and released through micro-porous membrane into a delivery tube and button diffuser on the bark. Evaluation of the system on mature trees tapped on HO panel using puncture tapping or short cut 1/8S d/3 systems has shown that most clones gave good yield response to the system. Clones PR 255, RRIM 703, PR 261, RRIM 600, PB 330, PB 311, PB 260 and GT 1 are among the good respondeers. Clone PB 235 showed slightly lower response. With short cut 1/8S d/3, the mean yield for clone PB 330 was 166.2 g/t/t (g/tree/tapping), while clones PB 311 and PB 260 had mean yields of 159.4 and 155.3 g/t/t respectively over a period of 22 months. With puncture tapping, clone GT 1 gave a mean yield of 100.4 g/t/t over a period of 42 months. The tapper productivity increased to 156, 175 and 244;of the normal tapping yield for clones PB 311, PB 260 and PB 330 respectively. The land productivity per year with these clones was 3267 kg/ha from PB 311, 3689 kg/ha from PB 330, and 3599 kg/ha from PB 260. The mean dry rubber content (drc) of latex in REACTORRIM area was comparable tot he drc of latex in the normal tapping area. The percentage of panel dryness at the end of one year was lower tahn the percentage dryness in the normal tapping area. The system has increased the income of the tappers. In commercial estate areas the income of tappers per month ranged from RM459 to RM1.253. In organised smallholdings, the smallholders income ranged from RM517 to RM1,288/month from tapping 5000 trees. The REACTORRIM has a good potential to solve the problem of shortage of skilled tappers. It can increase the productivity of rubber areas as well as income of rubber tappers. The system is recommended to be used on trees above 15 years of age.