A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
3/4" (19.05mm) x 24" (609.6mm) x 12" (304.80mm) 13 gauge expanded metal. Made from A36 mild carbon steel alloy. Common structural steel in USA. Minimum yield: 36,000 PSI (250 MPa). Ultimate tensile strength: 58,000 to 80,000 PSI (400-550 MPa).