The ideal book clip to keep open your book pages - it's curved to avoid covering any of your page and also the clamps are designed not to touch the spine, so you can also clip chunkier books.
Details: 
Product Size (W x H x D): Approx. 4.7 x 3.0 x 1.6 inches (120 x 76 x 40
Product Weight: Approx. 1.7 oz (49 g). 
Material: ABS