The main advantage of binding with plastic comb elements is the possibility of adding or subtracting sheets without damaging the sheets or the plastic comb elements.
When binding with plastic comb elements, the pages can't be turned by 360 degrees as spine gets in the way.
Plastic binding combs are suitable for binding documents up to 48 mm thickness.
Round plastic comb elements allow pages to be turned easily and to be laid flat.
Oval plastic comb elements designed for thicker books for more strength.
Check binding thickness table in attached PDF
