This one is equipped with air filled rubber wheels at the front

Piston pin

with a serrated underside that bites into the material

width 30mm

Aqiila Tagbird Nyckelring 1-pack PriceGroup-16 This one is equipped withTagbird The Smart Tracker for Your Most Important Belongings Never lose anything again. Tagbird helps you keep track of everything from keys and backpacks to pets and vehicles whether it's under the couch or left behind somewhere. It works with both Apple and Android, making it the only tracker you need. Ring play sound on tagged items Locate tagged items on a map Proximity alerts Delivered in a ready made display 10 x 1 pack Simple and smart tracking