Free Express Shipping! Archival Methods 2-Ply Pearl White Conservation Mat Board (16 x 20", 25 Boards) For Artwork, Photos, and Documents, Acid- & Lignin-Free, Made from Purified Wood Pulp, Calcium Carbonate Buffered, Warm Tonality
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.