SAE F-1 felt is made of 95% off-white wool and has a density of 0.036 g/cm3, and is best suited for applications where unusual strength and hardness are required and is good for oil retention. Common products made with F-1 felt include washers, wicks, door bumpers, polishing blocks and parts where wear and resistance to abrasion are required. Available in a variety of lengths and widths. * Natural wool is used, color variation may occur*