Prym's hollow rivets are available in different sizes, making them suitable for various material thicknesses. The differences lie in the diameter of the head and the length of the pin. The longer the pin, the thicker the materials, such as leather, that can be riveted. The hollow rivets are made of stainless, silver-colored brass, providing visually clean results for every application. Prym offers hollow rivets for use with the Vario Creative Tool and the corresponding tool set.