This watch protecter made of Stalinite which durable and strong. It's Unique Silicone Adhesive design which can be washed, reused and reapplied. The precise cutting technology makes the screen protector to adapt to every curve on the screen. Feature - - Material: Stalinite. - Size: 5x5x0.2cm. - Compatibility - Designed for Watch (40mm Series 4) ONLY. This Watch Screen Protector is made of a flexible film that offers clarity with no bubbles and no rainbow marks. Please NOTE: It's normal for bubbles or a rainbow effect to appear during the initial application since they will disappear once dry. - Unique Silicone Adhesive – This screen protector could be washed, reused, reapplied. The wet-install process allows for adjustments during the installation and leave the film perfectly contoured to any device. Please watch our installation video for perfect installation. - Specifically Design – The precise cutting technology makes the screen protector to adapt to every curve on the screen. Material flexibility allows coverage even on curved devices. This 6 Pack Watch Screen Protector is designed to stay compatible with all cases. - Optically Transparent – crystal clear screen protectors are smooth to the touch, offering " " feel and keeping the bright and colorful quality. - Scratch-Resistant -- With strong 9H hardness level, the whole tempered glass screen protector gives your protection against drops, bumps, scratches and daily wear and tear. Package list: 18 x Protective Films