Large Security Stamper Kit includes one Secure Stamper & 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 & packages ready to be recycled. Covered information cannot be read, scanned or copied. Marker has a durable 4mm chisel nib to cover areas quickly & precisely. Stamper has a 15/16" x 2-13/16" impression size.