These blocking pins are made of high-quality stainless steel, rust-resistant and durable. The sturdy steel rods fit holes perfectly and are nicely polished to prevent snagging. Available in two lengths: 3.93 inches and 5.9 inches, allowing multiple squares on the blocking board at once. Comes with a durable storage case for easy organization. Note: Clean with soap and water before first use to remove oily residue.