"The First Alert Auto/Marine Fire Extinguisher 4-Pk. is rated class 10-BC. This marine fire extinguisher is ideal for use on all types of boats. Fights flammable liquid and electrical fires. White color matches typical marine coloring. Durable metal head designed to meet demanding needs. If used, unit can be recharged by a certified professional. Includes mounting bracket to keep unit secure. Meets UL standards. Rechargeable Yes, Bracket Type Plastic, Comes Pre-Charged Yes, Cylinder Material Steel, Product Type Auto/marine extinguishers, Strap Type Plastic, Includes qty. 4, Dimensions D x H in. 3.6 x 14, Rated UL rated class 10-BC. UL rated class 10-BC Rechargeable Durable metal head Corrosion-resistant metal gauge for marine environment Metal pull pin with safety seal prevents accidental discharging Bracket and strap are included for secure placement of extinguisher Chemical-resistant & waterproof label with 4-step instructions won't deteriorate under marine conditions"