Material: Purple Heart. Instrument: We recommend Purple Heart for Electric Guitar, Acoustic Guitar & ArchtopJazz Guitar. Tone: Purple Heart is on the cusp between an electric guitar and acoustic guitar use. Warm mellow tones can be achieved on an electric guitar however the relative hardness of Purple Heart is likely to slightly brighten the tones of most acoustic guitars. Design: Timber Tones are CNC Milled from the very best quality timber then hand sanded and hand polished to give them their amazing shine and smoothness. Timber Tones unique shape is roughly based upon the classic 351 design, however they are 2.4mm thick where you hold them, chamfering down to 0.7mm at the playing tip. Contents: This pack contains 4 Purple Heart Timber Tones Guitar Picks. Notes: Although we have tried to ensure that our photos represent the Guitar Pick that you will receive, there is a high level of variety in our picks due to the nature of many of our natural materials.