What the per-Kilogram rate represents
The figure at the top of this page converts the international Tin benchmark into a price per Kilogram, expressed in Canadian Dollar. Industrial metals are quoted on exchanges in tonnes or in cents per pound, which is convenient for traders and useless for a fabricator pricing a job. Converting to a per-Kilogram figure lets you multiply straight through by the mass of the material you need.
Because it tracks the live market, this number changes throughout the trading day. Global Tin trading is effectively continuous from the Asian open through to the New York close, so a rate you noted in the morning may no longer hold by the afternoon. Anyone quoting or accepting a price for a large quantity should refresh the page immediately before committing rather than relying on a figure carried over from the previous session.