Sony 12" Foam Speaker Repair Kit , Fits SS-U511, SS-U930, others, FSK-12A (4 PACK) Easy to follow illustrated instructions. Installation average time is 30 minutes per speaker. Perfect for any average do-it-yourselfer. FREE technical support. FREE shipping to any USA address. Join thousands of customers that have installed our New-Edge-It  speaker foam repair kits successfully! We are a full service speaker repair center, in business for over 20 years!