There is a small hole on the back to push out front part to take out pictures or change.
There are three sizes for you to choose from:
Diameter: 3.8cm, 4.5cm, 6cm.
Just put in the picture between front and rear plastic parts and press them to fix them.
Picture sizes&Badge unit weight:
For 38mm badge, picture size 34mm diameter round; 4 gram.
For 45mm badge, picture size 38mm diameter round; 9 gram.
For 60mm badge, picture size 54mm diameter round; 13 gram.
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