Jam-free performance with S.F.®4 Premium Staples. 100% Performance Guarantee—Guaranteed to perform at the highest standards, including no jamming, for the life of the warranty (assuming normal product usage) or Swingline will replace the product. 25% greater capacity than other desk staplers. Staples up to 25 sheets (based on 20-lb. bond). Durable die-cast all-metal construction.