Charles Ellicott Commentary Exodus 38:29

"And the brass of the offering was seventy talents, and two thousand and four hundred shekels." — Exodus 38:29 (ASV)

The brass of the offering —i.e., the bronze which the people had offered in consequence of the invitation addressed to them by Moses (Exodus 30:5; Exodus 30:24).

Seventy talents. —No great quantity was needed, since bronze was only required for the laver, for the altar of burnt offering and its vessels, for the sockets of the Tabernacle gate, for those of the court, and for the “pins,” or pegs, both of the court and the Tabernacle.