You are Buying a brand New And Factory Sealed DIABLO 9 in. 4/6 TPI Demo Demon Bi-Metal Reciprocating Saw Blades for Nail-Embedded Wood Cutting (15-Pack)..5x longer cutting life versus standard bi-metal blades Perma-SHIELD coating protects the blade from heat, gumming and corrosion Ultra-hardened cutting edge provides 5X durability and longevity Unique plunge tip design enables faster and easier plunging 1 in. demolition body for straighter cuts with less vibration Diablo Demo Demon Reciprocating Saw Blades. Leveraging patented variable tooth technology, the 9 in. x 4-6 TPI blades bite into lumber to make quick work of teardowns and demolition projects. Bi-metal construction gives the blades utmost durability and a Perma-SHIELD coating reduces drag for smooth operation in rugged applications.