What kind of materials are used in these paper plates to prevent leaking?

The paper plates feature a soakproof material that holds wet foods without leaking.

What is the diameter of each paper plate in this pack?

Each paper plate has a diameter of 10 inches.

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Genuine Joe 10319CT Printed Paper Plates, 125 / Pack - 10" Diameter Plate - Paper Plate - Disposable - Assorted - 500 Piece(s) / Carton

125 / Pack - 10" Diameter Plate - Paper Plate - Disposable - Assorted - 500 Piece(s) / Carton
Soakproof material holds wet foods without leaking
Durable construction supports dense foods without folding
Disposable design allows quick cleanup after use
Perfect for use at company gatherings, parties and more