Pentalic - Hardbound Watercolor Field Book - 7x10 - Pentalic Hardbound Watercolor Field Books are a hard cover, double wirebound book with 140 lb. acid free watercolor paper. Use Pentalic Watercolor Field Books as a watercolor field book. Portable and of perfect dimensions for landscapes. All books are side bound for land and seascapes. This pad is 7 x 10 inches and contains 24 sheets of quality watercolor paper.