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The switch films by Durock feature a 0.15mm thickness perfect for tightening up the top housing on MX style mechanical keyboard switches. These films feature a dual material composition with HTV (Vinyl) on one side and Polycarbonate on the other. Each pack comes with 120 films which will cover a full size keyboard with extras.
Durock recommends installing the switch films with the HTV (Matte surface) facing lower/bottom housing and the PC (Transparent surface) facing the upper/Top housing.
Work as you expect, my preferred choice