Master's Bonsai Tool Kit (3 Pcs Per Set) Jttk-06 Including Knob Cutter (8") / Branch Cutter (8") & Tweezers All Were Manufactured Via Stainless Steel Master's Quality Quality: master's grade, handmade by the master worker from TianBonsai, have the best quality in our tools. Including Stainless Steel Knob Cutter (8") / Branch Cutter (8") & Bonsai Tweezers Master Quality Material detail:the Knob Cutter and Branch Cutter , manufactured via 5Cr15MoV stainless steel. the Bonsai Tweezers manufactured via 3Cr13 stainless steel. Hardness detail: Knob Cutter and Branch Cutter were differential heat treatment by the high frequency machine, the working edge's hardness is over HRC58. Quality Assurance: 3 Years, in normal use, if the tools have any problem, we will resending a new one to you without any fee, you just need to take a photo to us to show the problem.