Syntec 7" Rapida Cup Wheels use new Rapida technology to make a soft bond tool with coarse grit diamonds that is heat resistant. This Diamond Cup Wheel continues to perform well in high heat situations like using on extremely hard trowelled smooth concrete when other cup wheel's segement surfaces would glaze over and become useless. Syntec has been bringing premium diamond blades and cup wheels to the industry for decades. This 12-Segment cup wheel works great for preping edges and powering through hard surfaces other soft bond wheels struggle to.