BON4 Magnetic Ball Stretcher Kit

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BON4 innovates yet again with this unique magnetic ball stretcher system!

Combine any of the three sizes or use individually - this kit offers 6 different sized possibilities when you combine the individual 3 ball stretchers in different ways.

This kit is easy to use thanks to the magnetic opening. Made from sus304 stainless steel.

  • Kit contains: 3 Magnetic Ball Stretchers (0.47"/12mm, 0.94"/24mm, 1.41"/36mm) and a felt storage bag
  • Inner diameter: 1.3"x 1.6" / 33mm x 37mm
  • Weight: 130gr + 275gr + 385gr
  • Total weight: 772gr

Additional Information

Measure Up!

If you are not sure about about the best fit for you, please enter your measurements in the comments box during checkout and we will endeavour to ensure you get the perfect fit.








90 - 95cm

95 - 100cm

100 - 105cm

105 - 110cm

110 - 115cm

115 - 120cm

Customer Reviews

Good purchase.


Really nice upgrade to the other SS weights that use a hex key to open and close. These are much easier and quicker to put on.

I've worn the medium weight all day and have found it very comfortable. It stayed secure and didn't pinch at all. Just a really good design and i'm sure to get a lot of use out of them. Cheers.

(Posted on 29/05/2018) Review by William

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