"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, Strap Type Plastic, Includes qty. 4, Comes Pre-Charged Yes, Dimensions D x H in. 3.6 x 14, Rated UL rated class 10-BC, Product Type Auto/marine extinguishers, Bracket Type Plastic, Cylinder Material Steel. 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"