Fluid 100 Watercolour Paper is an archival, 100% rag cotton paper that is gelatin-sized. It is produced at slow speeds for precise control, resulting in a stronger, more premium-quality paper. Fluid 100 Blocks utilize a completely unique Easy-Block binding method that provides artists the chance to use them as block or pad. Easy-Blocks remain open on two edges, allowing for easy removing of finished works. Perfect for on-the-go creativity!