They consist of a laminated elastomeric bearing with a sheet of PTFE vulcanized or recessed in a suitable steel plate. There is a sliding plate on the top, plated with stainless steel and mating the PTFE sheet and a steel plate at the bottom, vulcanized to the elastomeric bearing and allowing the fixation to the structure through bolts or dowels.

The mark used to identify the bearings are the following:

NTU a(mm) x b(mm) x c(mm) for the sliding guided bearings. a and b are the dimensions of the bearing in plan and c the thickness

NTM a(mm) x b(mm) x c(mm) for the free sliding bearings. ‘a’ and ‘b’ are the dimensions of the bearing in plan and ‘c’ the thickness.