I have used Oregon 396-727 G6 blades for years on my TCII 61 inch. They cut very well and seem to last long but they start loosing metal on the mulching fingers. I don't use a shoot block during the grass mowing season and I mow in a very dusty area. Is their a non mulching blade that will last longer? I mow mixed grasses and I love the finished product of the blades I have been using. Just looking for a little more life.