Magnetic Lid Box

My kids wanted a magnetic lid treasure box so this is what I came up with. Uses four 10mm diameter x 3mm neodymium magnets for the closure.

Magnets: https://www.amazon.com/Refrigerator-JACK-CHLOE-Stainless-Approximately/dp/B01MFHNHNW/ref=sr_1_2?ie=UTF8&qid=1531529009&sr=8-2&keywords=neodymium+10mm+x+3mm