1. Surface resistance: Surface electrical resistance below 0.05 Ω, the shielding performance is between 70 and 90 dB, 99.9999%. 2. Size: 39 'x44' inches (100x110 cm). Each piece is sold 44 inches wide by 39 inches long. If you order more than 1 quantity and need a continuous length, please indicate this in the seller notes or we will send each piece as 39 'x44' inches. 3. Usage width: This signal shielding material can be used for many products. Such as maternity clothing, suits, curtains, blankets, bags, phone cases or laptop, mainframe chassis covers and are commonly used to make RFID antitheft wallets, card pouches, outdoor waist bags, passport covers, etc. The shielding performance is when you fully wrap the item. 4. Protect us better: Nowadays, high technology updates every day and hacking technology is becoming more developed. If we do not protect our electronic devices, our private information will be taken by others without knowledge, our success will also easily disappear.