made of eco-friendly material

it's (literally) a softie on the inside

Difficulty: Beginner

5" Wide x 4" High

including a few more advanced ones

F-3 Industrial Felt By Foot Thickness:3/8" made of eco-friendly materialHeavy Duty Industrial Felt SAE F 3 Felt is one of the most durable industrial felts with an 85% wool content. F 3 serves the same general purposes as F 1 but is slightly less dense. Its advantages include excellent vibration absorption, resistance to abrasion and wear, and applications that require a coarse wool. F 3 felts is suitable for precision applications such as vibration mounts, precision lubrication wicking, oil seals, bumpers, gaskets,