These are great conversation pieces - Best seller locally. Engraving is on one side only. Size is approximately 1.5" x 3" Eco-friendly information: Boxes/Packing Slips/Shipping Materials - the vast majority of the paper and cardboard that we use on a daily basis can be recycled, composted and are biodegradable. We re-use boxes when available. We are making an effort to reduce plastic in our shipping. Any peanuts used are biodegradable potato peanuts. Wood, Veg Tan Leather - both biodegradable and compostable if left long enough. Metal in Keychain/ring - can typically be recycled at your local recycling center