4" Sunflower Resin Disk. For concrete, engineer stoned and granite, wet polishing only. · Our most successful multipurpose pad for wet cutting all types of stone as well as concrete · Copper bond exterior with resin bond interior makes quick work of most jobs, these pads are real time savers · Aggressive in low grits, even our 400 grit is more aggressive than most other comparable pads and will remove material · Ideal preparation for final polishing · Will greatly reduce those waves or ripples you see when you look closely at your finished surface on most granites · For longest life and best results these should be used wet or with light head weight and low RPMs - keeping the diamonds moving and the heat down Price per disk. (Free 2nd day air shipping if 9 disks or more are ordered)