We have revamped our very popular "Magnums" and now produce them for you in an easy to wear version.
These come with a set of 4 digits 0-9 so is a number for life!
Supplied in a sleeve these can clip to your waist or collar  between the shoulder blades using a conventional number clip (not supplied) 

waterproof, comfortable and easy to change the digits without removing the sleeve just slide the numbers down and the little magnets will grip .