supply of printed computer forms for 1 year supply of printed computer forms for 1 year on rate contract , 9x12x1 casba challans in 70 gsm a grade paper ( tnpl/west coast/spb ) single side printing 4 challan in one page , 3 perforation , as per sample , fd receipt 12x5x1 continuous computer sheets with 01 vertical perforation , double side printing , ( two colour printing on one side and single colour on other side ) . lucky parchment paper 120 gsm serially numbered ( as per sample ) , csdt receipt 12x5x1 continuous computer sheets with 01 vertical perforation , double side printing , ( two colour printing on one side and single colour on other side ) . lucky parchment paper 120 gsm serially numbered ( as per sample )