Personalized Mechanical Gears Baby Bib. Mechanical Engineer in gray text and a row of gears below will put your favorite engineer in gear for the day. Unique gift design for your mechanical engineer at birthdays, holidays and graduations. Our Baby Bib is rated high in convenience and durability and with a variety of fashionable colors, your baby can be trendy. Mix and match to any outfit. 100% cotton ring spun combed heather colors are cotton-poly. Width 7.75", Length 11.75"