Ferrules are the bit of rubber that fit over the end of the stick that is in contact with the ground. Ferrules wear surprisingly quickly and you should regularly check them for signs of wear. Ferrules can be bought in different sizes and colours. Most common are grey and black colours but you can also get brown.
Typical sizes are 16mm, 19mm, 22mm and 25mm. We keep the Heavy Duty Grey ferrules in various sizes and the black bell shaped ferrules due to their good grip on the bottom.The black ferrules are available in 19mm only.