Gifts Infinity Personalized 4oz Acoustic Guitar Shaped Flask - Free Engraving. Personalized 4oz Acoustic Guitar Shaped Flask - Free Engraving. FREE Custom Engraving! Please send us a message after checkout with your text for engraving Personalize with up to 2 lines, each up to 20 characters each. Choose font from any of our 29 listed, located in the last image of this listing. Size - 3 Inches X 6-3/8 Inches X 7/8 Inches