Selected properties, such as wood basic density, bark basic density, thickness and percentage of bark, fibre length and cellular proportion of 28 to 30 year old Hevea brasiliensis(HBK) Muell. Arg. (rubber wood) have been studied. The wood is light to moderately heavy and lighter than bark. The fibre length is higher than average for fast growing hardwood species. Except in the thickness and percentage of bark, no statistically significant differences exit between the three height levels (0.5 m above the ground, 50;and 75;of tree heights) in basic density, fibre length and cell type percentages. The basic density and fibre length show an increasing trend from the pith outwards (with an increase in age), although they remain constant or decrease near the bark region. The radial patterns of variation in basic density and fibre length (in parabolic curves) suggest the occurrence of jevenile core of about 9 cm radius, which is important in determining the quality of sawnwood.