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Ive done some digging and it looks like the “S7” black bases on most armada skis are sintered. Im basing this on a a few venders item specs that called the base the “S7 sintered base” or linked the two like the paragraph in the image below
from https://www.getboards.com/armada-al-dente-zero-collection-skis-2017/
... which is good because sintered bases are faster. And also i just bought some armadas.