1.Felt Washers 2.Wool Content:100% wool 3.Specification:19.6mm*14.6mm*1.5mm 4.Density:0.25-0.4g/cm3 Felt Washers Use: Flexible seal out Dust absorb the Shock reduce Friction USE IN: ♦Telecommunications ♦Electronics ♦Automotives ♦Computers ♦Musical Instruments The specification depengds on your specific requirements. Welcome to contact us for more information. Felt Washers