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20 - High-quality SFK or Temkin seals (7325259 (was 6679135))
perfect fit for your fingers
It can be mounted in any direction that you prefer to have your Rotary
These fidget toys are used by twirling it from finger to finger (there is skill involved and practice makes perfect)
Solids Of Constant Width - Heptagon- Set of 3 Material:Brass 20 - High-quality SFK orSet of three Cones of constant width. This model is based on a Heptagon. CNC machined in Canada out of brass or aluminum bar stock. Approximately 1" in diameter. These are non spherical solids that amazingly have constant width in every directionallowing them to roll smoothly. They are derived from two dimensional curves that were put into use by the 19th century German engineer Franz Reuleaux.