Essential part for tensioning the saddles on your Strat. Black plated steel springs. While Fender describes these as "SPRING BRIDGE 4 COIL 3/8 BLACK" they actually measure .163" outside diameter, .366" long. American Deluxe/American Series Stratocaster® Intonation Springs, Tall 3/8" (for A,D,B, High E String), Black (12) . Brand New. Genuine Fender 0019394049. UPC 717669069414. Photo may not reflect current Fender packaging.