NGSi Shield Apple Watch Tempered Glass Screen Protector 42mm - Lifetime Replacement Warranty - High Definition (HD) Ultra Clear Screen Smart Film - Extremely Smooth Strongest Most Resistant Screen Protector for your Apple Watch Complete Solution to Smart Watch Screen Protection Tempered Glass provides your smart watch with the best surface protection without sacrificing the responsiveness of touchscreen. Despite its slim 0.3 mm glass base thickness, this transparent tempered glass is nearly impossible to scratch or penetrate thanks to its rating of 8-9H hardness Offers resistance against smudges and fingerprints.