Features of The Zipp Clamp 1). Easy and quick to use. 2) Comes in 3 popular sizes (other sizes can be custom cut for you). 3) Includes a water-resistant, acid-free board. 4). Lightweight (good for trips and classes). 5). Entire Sheet is paintable, except for the 1/2" border 6). Paper does not have to be cut-out when the painting is finished 7). Deckle edge is left intact. It is not torn nor stained. 8. Reusuable and long-lasting therefor very affordable. SEE OUR ADVICE LIBRARY UNDER WATERCOLOUR FOR TIPS ON USING THE ZIPP CLAMP.