For actively used, bulky files. Heavy-duty 23 pt. stock features built-in antimicrobial to guard against the growth of bacteria, odors, algae, mold, fungus and mildew. Durable TyvekŪ gusset expands to hold 2" of material. Each folder has two 2" K-style prong fasteners in positions 1 and 3. Straight-cut 3/4" wide tab. Blue exterior, manila interior; matching TyvekŪ tape. 10% recycled material with 10% post-consumer content. Letter size. Acid-free, archival quality. 25 folders per box.