Swingline S.F. 4 Premium Staples provide strength and durability for dependable stapling. Tests show 75% fewer failed staple jobs than comparable staples. These staples have proven greater performance – they're made with 135,000 PSI premium grade wire for greater tensile strength. Designed with precision-engineered chisel points that penetrate papers easily, preventing jams and other stapling disruptions. Staples with 1/4” leg length can comfortably fasten up to 25 sheets of paper, making them a perfect choice for most projects and presentations. A full strip contains 210 staples. The convenient, reusable storage box contains 5,000 staples, allowing for long-term productivity with fewer re-orders. Includes 20 boxes per case. Sturdy staples are compatible with most standard size staplers.