BambooMN Bonsai Tool Kit - 8" Concave Cutter, 8" Knob Cutter and Bamboo Brush Use these high quality knob and concave cutters to make clean cuts in your bonsai tree that will grow back flush with the surface, leaving little or no scar! Set includes 8" Concave Cutter, 8" Knob Cutter and Bamboo Brush. Metal tools are hand forged from carbon steel. These traditional looking bonsai tools are very high quality, and an amazing bargain at this price. These tools are great for the advanced or starter bonsai enthusiast. They will last a lifetime with proper care. Wipe clean and lightly oil after every use. This tool kit is made in China with very high quality control. We guarantee you won't be disappointing with a 3 year replacement warranty.