Numbers 7:86

כפות זהב שתים עשרה THE GOLDEN SPOONS WERE TWELVE — Why is this stated at all, since we have been told that twelve princes brought each one spoon? But because it is stated in each instance: “one spoon עשרה זהב”, I might explain it either as meaning: it was of gold but its weight was ten shekels of silver, or, perhaps, not so, but it means: one spoon of silver and the weight thereof ten gold-shekels — and the gold-shekels have not their weight equal to those of silver-shekels — Scripture therefore states here, “golden spoons” — the spoons themselves were of gold ( Sifrei Bamidbar 55).

כַּפּ֨וֹת זָהָ֤ב שְׁתֵּים־עֶשְׂרֵה֙ מְלֵאֹ֣ת קְטֹ֔רֶת עֲשָׂרָ֧ה עֲשָׂרָ֛ה הַכַּ֖ף בְּשֶׁ֣קֶל הַקֹּ֑דֶשׁ כׇּל־זְהַ֥ב הַכַּפּ֖וֹת עֶשְׂרִ֥ים וּמֵאָֽה׃

the golden spoons were twelve, full of incense, weighing ten shekels apiece, after the shekel of the sanctuary: all the gold of the spoons was a hundred and twenty shekels.