For only $55, these Rounded Concave Cutters are unbelievably solid! I would compare these to the $150+ Japanese tools that cost a fortune to ship. They are extremely sharp and cut through my trees like butter. I only got the Series 7 which is the smallest version and I’m shocked at how well they perform on my small/mid size trees. I’ll be back to get the complete set and thanks for the fast 2-day shipping!