I always loose mine, and I'm sure I'm not alone.
Ideal for when you are walking and local requirements ask you not to use carbide tips to protect the earth.
However we see another use for them, when using the 16mm Extender Tube to link a pair of slim line poles together to support your Teepee or tarp tent.
You don't want a sharp end to go through the roof or the floor, so these rubber ferrules will protect your gear.
Sold as single items and will fit all the poles tips we can think of!