QIBOX Premium HD Clear Tempered Glass Screen Protector for for Fitbit Surge Fitness Superwatch 9H Hardness Multi-layer Explosion-proof and Anti-Bubble Screen Guard Compatible Model: Fitbit Surge Fitness Superwatch Premium grade Japanese Asahi tempered glass with 9H scratch resistant surface. It is almost as hard as a diamond with highest resistance at 10H. Precise laser cut tempered glass made with polished round edges. High definition clarity and touch screen accuracy. Bubble-free, easy to install, and perfectly fit