3M Privacy Filter for 21.5" Apple iMac Monitor (PFMAP001) Effective "black out" privacy from side views outside the 60-degree viewing angle Helps reduce reflections so you see your screen clearly with pristine image clarity Reversible between a glossy side and glare-reducing matte Designed with advanced microlouver technology, creating an excellent high-resolution viewing experience Matte surface helps reduce glare and hide fingerprints