Urban Poling exclusive bell tips are made of durable rubber for our ACTIVATOR Poles. The bell-shaped tips provide greater stability and weight bearing than the traditional Nordic walking boot tips. Replace bell tips when the tread begins to wear and affect their stability, grip and shock-absorbing capabilities. Our exclusive bell tips: Improve stability and balance. Absorb vibration to reduce impact. Provide excellent traction on hard surfaces, both indoors and outdoors. Are quickly and easily removed to expose the carbide tip for walking on softer surfaces such as sand, trails and snow.