E = mc2 keyring

E = mc2 keyring 3d printed Art Mathematical Art
This version can be printed in stainless steel. A bigger thicker ring has been added and the number 2 has been made a little more thick too. You have the other versio here: Click here for the other version
cm: 7.18 w x 0.54 d x 3.124 h
in: 2.827 w x 0.213 d x 1.23 h

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