2 Stainless Steel Springs Prefilled with pure platinum catalyst. Compatible with most vintage hand warmer brands.

Hakkin Peacock, JC Higgens, Sears, Abercrombie, Peterson's, Dickson, Walker, Compact, Soling, and many others

Not compatible with Jon-e

Catalyst and Spring made in the USA

I also sell kits or have available carbon felt,  cotton, stainless steel mesh, wick, or replacement pouch for any make & model or if you have any questions please feel to reach out