Compatible with OBC payroll statements on the market. Compatible with inkjet printers, digital printers, and perforated printing machines. Please note that the laser printer may have some wrinkles than the model. A4-size tri-fold and 3-compartment storage envelopes are double sided tape on the lid for smooth sealing after sealing the paper. It is also environmentally friendly and can be recycled, without sorting after use. We created an ecology and economy concept.