Radians SJ31-3ZGS-XL Class 3 Hi Viz Tri Laminate Soft Shell Jacket, Green, Extra Large Laser cut blades feature a ply of copper sandwiched between two layers of blade steel which results in a very quiet vibration reduced performance Smooth running blade produces cleaner cuts, longer blade life, as well as significantly lower noise levels for the operator Medium bond that holds diamond chips result in a very desirable tool for cutting very hard materials Laser cut design produces excellent heat disbursement and more precise cuts MK Diamond field proven quality