Depending on the model, these stationary wooden tables are offered in natural colors and darker tones. Varieties with height adjustable legs achieve this either by using an inside regulator or double security knobs. Some metal tables have collapsible legs and stationary metal tables are made with epoxy-coated steel frames. Foam thickness varies by model from 5 to 7 cm as does the density which varies between 25 to 40 kilograms, but all are EC compliant. Constructed of Class M2 faux leather, all models are guaranteed for three years. Standard features include both a bung and breather hole but some models may also have a paper-roll holder.