Linear Polarization A4 Sheet Polarizer Educational Physics Polarized Filter Optical</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>High Contrast Linear Polarizing Film</li><li>High Transmission of Unpolarized Light from 400 – 700nm</li><li>Excellent Extinction Ratio</li><li>Available in Various Sheet Sizes for your Customized Use</li><li>Great for experiments and learning Physics. The sheet is 0.2mm thick and 8.27" X 11.69" (21cm x 29.7cm)， IMPORTANT(!) please note that on both sides there is a protective film sheet. You have to remove it gently before use. Once removed， the polarizer sheet will be revealed， clean and smooth.</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41TaYFZHGtL.jpg' noproxy></br>