This D4 has no face! It is based on the
D4, a truncated sphere with numbers located on the rounded areas of the vertices.
This die uses the second generation of process to transform the truncated sphere into a shell.
This die can also be used as a pendant: by inserting the necklace into the two appropriated holes you can show any of the four numbers.
See also the very popular
D4 Shell Die of generation 1 and the Gen 2 collection:
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D3 Shell dice - Gen 2
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D3 Fudge Shell dice - Gen 2
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D4 Shell dice - Gen 2
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D6 Shell dice - Gen 2
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D8 Shell dice - Gen 2
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D12 Shell dice - Gen 2