Transformer Clear - Wood & Carbon Fibre GlassesThe multi layer two pin wood3 tech glasses are made using natural walnut, kosso and ebony wood with acetate tips. High quality 2: 3 claw spring hinge for comfort. Suitable for prescription glasses, they are supplied with clear demo lenses or blue light blocking lenses. Clip on lenses can be purchased as a set Transformer with TAC polarised blue or yellow RV tint. Multi layer wood3 frame with acetate tip Wood3 technology = wood > carbon fibre > wood