Xi 'an, where can I buy soundproof cotton? thank you

Xi Andi Audio is a car modification shop specializing in car sound insulation. Their powerful sound insulation product, Super Windsor, has a super sound insulation effect, does not absorb water, can't ignite an open flame with fire, and has a good absorption effect on medium and high frequency noise. Address: No.20-22, Building 5, Boutique B, Huineng Automobile Supplies Wholesale Plaza, North Third Ring Road, 029-63392877.