6pcs Nacodex&reg; Hd Clear Anti-scratch Screen Protector Guard Film Shield for Lenovo A850 Lenovo A850 Constructed in three layers; a scratch resistant surface polymer a hardened protective mask to prevent deep cuts damaging your device and finally a patented silicone gel that creates a vacuum to securely 'cling' to the device screen. Our screen protectors use no adhesive and there is no spraying anything to the protector or the device. Our screen protectors are made from Optical Grade Crystal Film which are custom cut to ensure a perfect fit every time.