تواصل مع Zehui Magnesium

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Select value is the composite key 'series/slug' (e.g. magnesium-oxide/zh-v2). The option label shown to the user is 'Series name — Grade name' (e.g. Magnesium Oxide — High Purity Magnesium Oxide ZH-V2). Never send or accept a bare slug: light-grade and food-pharma-grade exist in more than one series.