Switched out the stock bridge pins for ebony with pearl inlay, on my Martin D-13e. (May not seem exciting but it does help tone, and looks nice) : r/ guitars
Amazon.com: Acoustic Guitar String End Nut Bridge Saddle Abalone Pins Replacements Set (Ebony Pins & Bone Saddle Nut) : Musical Instruments
Bridge Pins Analysis: How Do They Affect Tone? - Guitar Unit
Amazon.com: MECCANIXITY Ebony Acoustic Guitar Bridge Pins Pegs, Guitar Bridge Pins Replacement Guitar End Pin Set for Folk Brass with Black Spot Pack of 6 : Musical Instruments
Bone vs Ebony (Wood) Bridge Pins Sound Comparison on Acoustic Guitar - YouTube