... /risers 1)PU lacquered or Unfininsed 2)Finger jointed 3)Surface: flat 1)Staircase accessory- Finger jointed beech wooden staircase treads/risers ... , oak, maple, beech, ash, rubber wood, teak, balsamo, cumaru, cherry and so on.2)The normal thickness we make are: 18mm ... treads we make are jointed, so the stability is good and firm. 5) The sides are double pencil round or Bull ...