Flap Discs are available in 115mm and 180mm diameter.
Various grit sizes are available.
Application, depending on the range, include:

Steel
Stainless steel
Plastics and wood
Rust and paint removal

Abrasive Fibre Discs are available in 115mm and 180mm diameter.
Various grit sizes are available.
Applications include:

Universal use
Metal
Wood
Non-ferrous metals