https://www.thespringstore.com/pc048-484-15500-mw-2810-cg-n-in.html
PC048-484-15500-MW-2810-CG-N-IN | Compression Spring Music W - The Spring Store
High-quality compression spring with 0.048" wire diameter, 6.81 lb/in spring rate, 15.5 coils, and durable Music Wire construction for industrial use.