Ultimate Guard Silver Comic Backing Boards Excellent volume and rigidity Min. 26pt. high bulk boards for extra safe protection of your most valued comics Full high quality front side coating Gives the rigid boards even more stability and lets your comics glide extra smoothly in and out of the bag 100% acid free, certified by independent lab This product is min. 7% calcium carbonate buffered, which makes it ideal for protecting comics 400g/m2 Backing Board weight Extra thick and rigid cardboard material to prevent your comics from bending and keep them free of creases Made in Europe Manufactured in the European Community to meet the high standards of serious comic collectors