Premium 4.5mm BBs, 177 cal steel bbs,177 cal bbs, High Precision Solid Carbon Steel BBS, Smooth Polished Rust Resistant Steel Pellets, Uniform Round Hard Steel Ball Bearings for Slingshot Shooting, Outdoor Target Practice, Backyard Fun Games, DIY Projects, Mechanical Parts, Packed in Reusable Portable Metal Tin. Crafted from premium solid carbon steel material, these 4.5 millimeter solid steel balls own high hardness, strong compression resistance and great wear resistance. Each steel ball is precisely processed with strict size standard, perfect roundness and smooth burr-free surface to ensure stable and consistent using effect. With excellent anti-rust and anti-corrosion performance, these sturdy steel beads are not easy to oxidize or deform, suitable for long term indoor and outdoor use. These versatile round steel balls are widely used for slingshot practice training, Hunting and Training, casual outdoor sports entertainment, catapult replacement parts, handmade DIY crafts making, furniture hardware fittings, instrument assembly accessories, weight balancing parts, industrial small spare parts and daily household auxiliary supplies. All steel balls are neatly placed in sealed reusable metal tin, easy to carry outdoors, convenient to organize and store, effectively avoid scattering and loss. 177 caliber (4.5mm) steel bbs177 metal bbs177 bbs high countbb gun bullets .177