Bruce Charles Designs

Robertson Brass Magnetic Slider

15 reviews
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Robertson Brass Magnetic Slider 

The Bruce Charles Designs Robertson magnetic slider introduces a totally new and unique slider for your enjoyment.

**NEW!! Effective 3/11/24: We have made some changes to all of the Robertson magnetic sliders. We switched from a 5mm diameter magnet to a 6mm diameter magnet of N52 grade, which our testing has shown provides a better experience.


  • Double-sided slider for two different slider experiences in one.
  • Symmetrical design allows for flipping one slider on top of another.
  • Magnet strength: Medium-strong on the strong side
  • Magnet configuration: 3 x 2
  • Magnet Type: 6mm diameter x 3.5mm length N52 grade
  • Dimensions: 31 x 49 x 11mm
  • Weight: 2.1 oz
  • Recommended for ages 16+
  • Proudly made in Dallas Tx, USA.

Superior Craftsmanship

The one piece body is CNC machined from a single piece of brass. The magnet bores are held to very tight tolerances to provide a secure press fit without any adhesives. The final magnet depth is set to precisely .8mm from the top surface for the strong side of the magnets using purpose-built jigs and fixtures.

Sliding surfaces intentionally have toolmarks, which after break-in will provide a wonderfully smooth sliding surface.

I decided that the overall design is so delightfully minimalistic that I didn’t want to put our logo on it. The only mark is a subtle “+” to indicate the strong side of the slider. So we’ll just rely on word of mouth when your friends ask you “Where did you get that!?” We know you’re good for it.

Excellence by Design

The Robertson is the result of a long design and redesign process that ran into a dead end. I was about to give up altogether. But before I abandoned the machining setup, I decided to try something totally different: A fidget slider with exposed magnets on both sides for symmetrical functionality. As soon as I tried the first one I knew I had stumbled onto something unique and enjoyable.

First, it was smooth. I mean SMOOTH. In fact, you could make it bold and throw in an extra “O” and that still doesn’t capture how smooth it was. So little brass is touching during sliding and rotation that it feels like a precision bearing.

Second, it was light and slim. At 11mm, it’s less than ⅔ the thickness of the Lowrey. If you prefer older measurement systems, it’s less than half an inch thick. I’m not sure how many barleycorns that is. See why metric is awesome?

Third, the exposed magnets on both sides enables two things:

  • The magnet depths are set differently on the two sides so there is a strong side and a weak side. You can change between strong and weak just by moving one slider to the back or front and using the other side magnets. On the strong side, marked with a “+”, the magnets are set to .8mm from the surface while they are 1.2mm from the surface on the opposite side.
  • The Robertson can do flips if you hold it JUST right.

Fourth, it is unique in its skeletonized design. This creates a slider that is visually engaging, and as a nice side effect, it also means it is very light! It’s actually lighter than our aluminum/brass Lowrey! But the mass is out near the edges, as are the magnets, so the inertia is there for laddering moves.  

A Gift to be Cherished

Presentation makes a lasting impact. Take delight in receiving and opening your Robertson box and packaging or enjoy watching someone you love unpack the gift box and realize this is no ordinary gift! 

What's the Robertson name all about?

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Based on 15 reviews

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