Full Face Mask For Snorkel- Easy Breath- 180 Panoramic Seaview- Innovative V Backstop Technology With Four Valves- Scuba Mask PC- Anti-Leak&Anti-Fog- GoPro Mount (Black/Red, L/XL) These 3 ring, zippered books measure 71/2" x 10" and hold PADI and most other log books. This beautiful log book is sleek and is built with a durable, sturdy construction.