Fender Nickel/Steel Super Bullets 3250SL Sup-Lite 8-38. Gauges 8, 11, 14, 22, 30, 38. Super Bullets: Nickel-Plated Steel Bullet End [3250s] The ultimate string for modern tremolo players! The combination of nickel-plated steel with Fender"s German patented Bullet end, which fits precisely in the tremolo block, creates one stable string! For all you heavy tremolo users, the end of your tuning problems hang on the end of these strings! Fender Model 073-3250-001