Use for business mailing. I cannot recommend this product. The tear off seal used to seal the envelope is weak tears easily and glue to seal is weak at best. To save a few dollars you have gone with an inferior quality. Your previous vendor had decent quality and was not only easy to seal but sealed properly.
I've been using these for several years to mail a bulk of 200 newsletters 6 times a year. They are easy and quick but the glue strip is getting narrower and narrower with each box I buy. I am concerned that there won't be enough glue to withstand the abuse of postal processing equipment.