What different specifications and grit sizes are available for the Feilun brand aluminum oxide sanding discs?

Specification

The Flywheel brand aluminum oxide sanding discs usually come in the standard sheet sizes, often 9 inches by 11 inches (230 mm by 280 mm). This size is designed to be easy for handheld operation and also suitable for use with various grinding machines, making sure the grinding process is stable and efficient.

Grain size selection
The grain size is a measure of how coarse or fine the abrasive material on the sanding disc is. It's usually expressed in "mesh". The Flywheel brand aluminum oxide sanding discs offer a bunch of different grain sizes from coarse to fine to meet the needs for different materials and grinding stages:

Coarse grit (like 36 mesh, 46 mesh, 60 mesh):
It's good for removing thick coatings, rust, or doing the initial rough grinding on rough surfaces.
The grinding efficiency is high. It can remove a lot of material quickly, but it might leave deeper scratches.
Medium grit (like 80 mesh, 100 mesh, 120 mesh):
It's for medium roughness grinding, like the initial smoothing of wood and metal surfaces.
It can keep a certain grinding efficiency while reducing the depth of the scratches.
Fine grit (like 150 mesh, 180 mesh, 240 mesh):
It's suitable for grinding when you need a high surface finish, like getting ready for car painting or doing the fine finishing of furniture surfaces.
It can further remove the scratches and make the surface smoother and with a better finish.
Extra-fine grit (like 320 mesh and above):
It's for situations where you need an extremely high surface finish, like polishing precision instruments and jewelry.
It can remove very tiny scratches and make the surface like a mirror.
The Flywheel brand aluminum oxide sanding discs have a really wide range of grain size choices, covering almost all the possible grinding needs from coarse to fine. Users can pick the right grain size based on the specific grinding material, grinding stage, and the surface finish requirements. At the same time, the Flywheel brand also offers several packaging options, like 50 pieces per pack or more, to meet the needs of different users.