Neopost DS-35, FPI-600 folding machine The DS-35 folder inserter will insert your mailings from a single sheet to 2 sheets with an insert. This easy to set up envelope stuffing machine is excellent for small office jobs. It works on 2 sizes of envelopes - DL and C5 has a catch basket and is designed to produce 30,000 inserts a month at a speed of 1,250 per hour. Works as it should and has been maintained by a local rep.