Medium Basing Grit is a staple of many basing techniques. Basing Grits are used to represent all sorts of dirt, s&, rubble or debris.A note on our basing grit: All Gale Force Nine basing grit is made from a porous organic material rather than sand or other minerals. This organic material absorbs glue & paint, insuring that everything stays where you want it. When using sand (or kitty litter or any other mineral), paint & glue tend to flake off over time. Packaged in a round plastic container approx. 2.75 in diameter, 1 deep.