WHATWEARS Fountain Pen Case Storage Bag For 48 Pens Leather Black Fountain Pen Case Storage Bag For 48 Pens Leather Coffee Brown Slot :Made of Tensile Rubber ,therefore the diameter of the slot can be adjusted to? about 20mm Fit Pens below? 155mm Length ,20mm diameter Pens pictured are not included From a trusted seller & delivery time is about 10-20 days.