Safecraft’s Model SC for sprint cars is completely automatic and includes a manual backup for added protection. Safecraft’s unique, fast-acting thermal sensor and compact, slim design targets hard-to-reach high risk areas & tight spaces—perfect when you need ‘mini’ without sacrificing ‘might’! The Model SC packs a powerful punch with 3M™ Novec™ 1230 Fire Protection Fluid in a 3 or 5 lb white aluminum cylinder.