vinolid holds aroma in the glass while keeping insects and other debris out. While it looks and feels like glass, it’s actually made from a food safe, BPA-free polymer which is shatterproof, dishwasher safe, reusable, recyclable and made in the USA. vinolid measures 3.5” in diameter so it fits most wine or other glasses and even many decanters!  The new microfiber bag includes 4 vinolids. Carry vinolid's in your purse or pocket. Use the microfiber bag to remove water spots from dishwasher.