The rubber shell ensures that the magnets for the running number do not slide around on the clothes and the bib during the run

From the designer brand Qualy

and that is why we have chosen to sell their products

We have provided the ISO specifications for this 2-ring binder mechanism in our photos section

This pack is sold as five (5) pairs

Power magnet, Skive 20x3 mm. knivskinne The rubber shell ensures thatNeodymium magnets Permanent magnets Diameter: 2 cm Height: 0. 3 cm Strength: approx. 3. 9 kg. These small, yet extremely strong magnets adhere to all magnetic surfaces, and they hold their own weight by many times. Suitable for magnetic glass boards. SPECIFICATIONS: Strength: approx. 3. 900 gr. Material: NdFeB Magnetisation: N45 Gauss: 13200 13700 (1. 32 1. 37 T) MGOe: 43 45 Max. temperaturee: 80C Surface: nickel plated (Ni Cu Ni)