Large Security Stamper Kit includes one Secure Stamper and one Secure Marker. Both contain a special black ink that completely obscures private information, working best on black ink. Ideal for hiding personal information on mail and packages ready to be recycled. Covered information cannot be read, scanned or copied. Marker has a durable 4mm chisel nib to cover areas quickly and precisely. Stamper has a 15/16" x 2-13/16" impression size.