Even though they're actually optically clear polyurethane, जबकि असलियत में ये पारदर्शी पॉलीयूरीथेन हैं,
परिभाषा
any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber पर्याय: polyurethan,
मोबाइल