Made of PU Leather Case Dimension : 330 x 250 x 30MM Fit differnt size of pens : The slot was made of Tensile Rubber ,so that the diameter of it can be adjusted to about 20mm Durable: made of high quality faux leather, perfect for long time us Large Capacity: two-layer design which contains 48 holes to insert pens in. No need to worry everything is in a mess