What size is the smallest protein that can be synthesized with the EasyXpress Protein Synthesis Kit?

For the Easy Xpress Protein Synthesis Kit based on E. coli lysate the largest protein successfully synthesized was 125 kDa and smallest protein 6 kDa . For the EasyXpress Insect Cell Protein Synthesis Kit the larest sucessfully expressed protein was 162kDa, the smallest around 5kDa.