Danger sign for pets

A sign I made for my birds cage it has space for a 1.24 in x .12 in disk magnet in the back you can find here https://www.amazon.com/FINDMAG-Neodymium-Double-Sided-Permanent-Scientific/dp/B08M33384G/ref=sr_1_6?crid=1LV5ZORBSG1UK&keywords=disk%2Bmagnet&qid=1692235428&sprefix=disk%2Bmagnet%2B%2Caps%2C109&sr=8-6&th=1