Package Includes: Two Small Pixie Tip™ and Two Large Pixie Tip™ *Straw and tumbler not included SIZES: Small: For straws 6mm to 8mm in diameter Large: For straws 8mm to 10mm in diameter (For straws 8mm in diameter, we recommend the large) Small: For straws 0.24in to 0.31in in diameter Large: For straws 0.31in to 0.39in in diameter (For straws 0.31in in diameter, we recommend the large)   The Original: Pixie Tip™ fits snugly on your favorite reusable straw so that you no longer need to purse your lips while drinking. This anti-purse mouthpiece is designed to follow the natural curvature of your lips making it easier to drink from a straw than you ever thought possible!