The foam-based features an open cell structure. The benefit of this is that retains water exceptionally well during wet/damp sanding operations. Thanks to this, even a smaller amount of liquid can be used, for a cleaner sanding process.

Sanding sponge disc with Velcro is available in different thicknesses. The discs and rolls are 6.5mm thick as default, and when higher density is needed for high gloss applications, they are available in 3mm and 5mm thicknesses, respectively.