These leather magnet pen clips by The Superior Labor are very strong and they can be used also on thick surfaces, like on your Traveler\’s Notebook or at the shoulder strap of TSL Engineer bags. The loop can be used with the pen clip or with the pen inside (it fits most of the regular-sized pens). It is also very useful as a clip, to keep the pages of a notebook flat open. The Superior Labor logo is engraved on it with gold foil. Bridle leatheris the way that a piece of leather (cow hide) is finished at the tannery. It has both sides, the flesh and grain, stuffed with greases and finished with wax. This is anintensive labor process. Size:4cm3.5cmMaterial: Vegetable-tanned cow leatherMade in Japan Attention: The leather used in this product is natural leather. We do not use scratches that lead to tears or rips, but we use scratches and wrinkles that are originally in the leather as a characteristic of the material in our products. In addition, there are individual differences in the color, thickness, and texture of the same leather. Please be careful of stains and color transfer when wet.