Crystals™ binding covers are completely transparent to highlight your title page. Durable plastic protects bound documents from spills and tears. Not for use with thermal-binding systems. Binding System: Comb; ProClick®; Spiral Coil; Strip; VeloBind®; Wire; ZipBind; Pre-Punched: Yes; Number of Holes: 19; Front Cover Color(s): Gloss Clear.