Sage {SE100} Compatible Tape Seal Payslip Mailers 100gsm (Pack of 500)Custom Forms Sage Tape Seal Payslip Mailers 100gsm (Pack of 500) SE100 Custom Forms Sage Tape Seal Payslip Mailers 100gsm (500 Pack) SE100 These Custom Forms Sage tape seal payslip mailers are easy to use simply print off payroll data from Sage on to each payslip, peel off the protective strip, fold in half and seal securely. It creates a self contained Royal Mail Letter size envelope with a window for the employee's name and address just add a stamp