The book shelf allows you to read with a book in one hand, freeing up your hand to do other things at the same time, such as cooking, teaching, etc. Thumb loops for unfolding book pages add to your convenience.Product Dimensions: Medium hole diameter is approximately 2.2 cmDurable and comfortable material: The transparent book page divider is made of acrylic material, which is safe and durable with long service life. The thumb ring binder is curved to fit most open books. The surface of the stand and the thumb ring in the center are smooth and polished, so there will be no discomfort when holding it with your thumb.The transparent page folder is a very practical gift for those who love reading; it can be given as a gift to teachers, students, librarians, writers and bibliophiles.Package Included: You will receive 10 transparent bookmarks, enough for your daily use and sharing with others; if you want to take a break, they can help you record where you read.Product size: Medium hole - thickened 10mm (9*3.4cm)