Sponges with Central Slot

Slot for centering and grooved surface with diamond shape, to disperse heat.
The air flowing in the channels lowers the surface temperature, maintaining the same efficiency as flat-faced sponges.
SDL-G Yellow First polishing, medium hardness, porous
SDL-B Blue First polishing, medium hardness, fine
SDL-A Orange, polishing, medium hardness, fine
SDL-W White, polishing, soft, fine
SDL-N Black, super soft, fine, final polishing