Those in wood similarly explained the difference between the wooden and the marble table tops. Sulfur can be used to create decorative inlays in wooden furniture. Some wooden with iron caps; modern ones of steel. The fairways are usually constructed of wooden or glass fibre frames. The marble stairs are visible through openings in the wooden risers. Furniture with wooden or leather surfaces reduce the dust mite population. Guttering in its earliest form consisted of lined wooden or stone troughs. Pesto is traditionally prepared in a marble mortar with a wooden pestle. Carpenters extensively use dimensional lumber in framing wooden buildings. Later wooden pipes were constructed with staves and hoops similar to wooden barrel construction. Other fields have wooden or plastic barriers. They are believed to have been constructed of sod placed over a wooden frame. Supported spindles spin on surfaces such as bowls that are usually ceramic or wooden. Large wooden or wickerwork shields were used. "Great Britain"s builders recognised a number of advantages of iron over the traditional wooden hull.