It's up to all of us to look out for our environment, learn how with our bookmark - My Eco-Friendly World! This book marker is informative as well as useful. This bookmark includes tips on leading and living a green lifestyle. This double-sided book slip is durable, attractive and great for branding and customer or client retention. Help keep our environment clear with the 4 R's. It's perfect for mailing since it fits perfectly in a #10 envelope!