NIFO felt holes are manufactured frome one-piece concrete plates (up to 12 m length) and, on request, can be made in any other length. The weather resistant 5 mm thick felt covering is not glued but is worked into the concrete. This means that the playing surface is permanently bound to the concrete offering an especially smooth surface. To the left of the following text place the section diagram, please circle the numbers 1 to 5.

1. The borders are of weather resistant,
     impregnated pine
2. Impregnated pine cross-beams support the
    concrete plate at 60 cm intervals
3. Drain-holes for rainwater
4. 5 mm thick weather-resistant felt covering
5. 30 mm thick concrete plate, reinforced
    with steel wire mesh