The cardboard inlay and plastic layer of the Schneider MF2, a membrane computer keyboard manufactured by Cherry from 1988. The inlay let's to label the function keys on both sides. The MF2 Schneider branding is still printed in the shell in case the inlay is missing.
<a href="//commons.wikimedia.org/wiki/User:MarcoTangerino" title="User:MarcoTangerino">MarcoTangerino</a>
<span class="int-own-work" lang="en">Own work</span>