This is a resin with high physical strength, high hardness and high toughness similar to ABS filament. Experiments have shown that the 3D model produced by eSUN's Hard-Tough Resin product, such as the carrier gear, can withstand high impact forces and other high-strength mechanical pressures. While using electric drills to test the toughness of the resin, there's no breakage on the model even after a few drills. For the application field, the material needs to have extremely high stress and strain performance, and that's why eSUN developed Hard-Tough Resin.