9 inch. 3 piece set. Easy locking lid. Reusable glassware. BPA free. Longer lasting than disposable foil & plastic. Freezer safe. Glass is pre-heated oven & microwave safe. Dishwasher safe. Locking feature for secure transportation. Translucent lid to easily view contents. Multiple handles to carry pie from the bottom or top. Portion guides to help cut pieces evenly. Dishwasher safe for easy cleanup. Made in the USA.