Engineered flooring is manufactured with a decorative layer of timber (called a veneer or lamella) bonded over layers beneath which is often timber. This not only provides some additional stability but also maintains the appearance of solid timber flooring. Various factory coating systems are now used that can highlight colour and grain together with other techniques to texture the surface for a stunning appearance. Most engineered flooring is pre-finished although some are designed to be sanded and finished after installation. Engineered floors may be laid as floating floors, glued to a subfloor as an overlay and in some cases fixed as a structural floor on battens. Products are available with both glueless jointing systems and tongue and groove joints.