As the good material for the bonsai tools, would need with high intensity, strong tenacity and wearability, so our Master's Grade tools were manufactured via the 5Cr15MoV alloy steel. this material, contains Molybdenom, Vanadium, 0.5% Carbon and 1.5% Chromium, after quenching treatment, it's hardness is over HRC58, have high intensity, strong tenacity and wearability.
But, please note one condition, because of this material contained 0.5% Carbon, it's surface still would be rusting. but because of it also contained the Chromium, the Chromium will formation a layer passivation film to protecting the body of tools and never let it rusting. so, if you don't tending your tools after long time used, perhaps you will find your tools have a bit rusty, don't worry, the rust only on the surface, it never injure your tools.
Professional Grade (below is the grade mark on the tools handle)

Professional Grade tools, material is 4Cr13MoV alloy steel and high-carbon steel, handmade by professional technicians from TianBonsai.
About 4Cr13MoV alloy steel, it slightly inferior to 5Cr15MoV alloy steel, but it also as the good material for the bonsai tool, contains Molybdenom, Vanadium, 0.4% Carbon and 1.3% Chromium, after quenching treatment, it's hardness is over HRC55, also with high intensity, strong tenacity and wearability.
Beginner grade (There is no grade mark on the handle)
To popularize the bonsai art, TianBonsai supplying the standard grade bonsai tools to the bonsai beginner, it's material is 3Cr13 alloy steel and carbon steel, handmade by skilled worker from TianBonsai.
About the 3Cr13 alloy steel, it contains 0.3% Carbon and 1.3% Chromium, after quenching treatment, it's hardness is over HRC50. this grade tools also have nice quality and complete function. it's popular price would let you have the nice tools for cross the threshold of the bonsai art easily.