Gold 4 in Line Sealed Electronic Bass Replacement Tuners Tuning Pegs Keys Machine Heads Accessories Tuner Parts for 4 String Bass for Ibanez Shaller and Warwick Bass Guitar - Walmart.com
List of Bass Tunings
How To Tune a Bass Guitar (Drop C - 4 Strings) By @ChamisBass | @fender #chamisbass #shorts - YouTube
Bass Guitar Tuner - E Standard Tuning (E A D G) 4 Strings - YouTube