The ELF-SE Drop-In Trigger maintains the Elftmann reputation for quality, craftsmanship and customer service in an affordable package. The mid-weight hammer combined with our exclusive .043 double double wound polished piano wire hammer spring provide reliable ignition and fast lock time. Made of wire EDM machined, hardened A2 tool steel and lightweight aircraft-grade aluminum. Extremely short takeup, clean crisp break and very short, positive reset. Non -adjustable 3.5lb pull weight, non-skeletonized trigger shoe and no bearings...but we’ll put it up against any trigger made - except our performance series utilizing sealed bearings.Ultra-Light housing is standard - Total physical weight of entire unit is just 2.3ozAvailable with a curved or straight shoe.