Using your Charvel Pro - Mod San Dimas PJ IV Bass Guitar is a breeze. First, tune it up using the Charvel® Open - Gear tuning machines. The DiMarzio and Charvel pickups offer different tones, so you can switch between them to get the sound you want. When you're done playing, wipe down the strings with a clean cloth to remove sweat and dirt. Keep the guitar in a cool, dry place to prevent damage to the alder body and maple fretboard. Periodically check the bridge and tuning machines to make sure they're tight. If you notice any issues with the frets or pickups, it's best to take it to a professional guitar technician for repair.