Marantz Speaker Foam Edge Repair Replacement Kit, 12", HD-77, HD-88, FSK-12F Easy to follow illustrated instructions. Installation average time is 30 minutes per speaker. Perfect for any average do-it-yourselfer. Our YouTube videos make installation easy! 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 proud to be a #1 seller on Amazon. We are a full service speaker repair center, in business for over 20 years!