We tested various types, lengths, widths, and density of bristles to make  that is guaranteed to make you send v17. 

Maximizes chalk removal while protecting the texture of the rock with boar hair bristles. Designed with a solid lacquered walnut body, ergonomic curved handle, and lasered "Flow" design for a unique aesthetic.

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19.71 is an homage to the removal of the gold standard. Since we can no longer afford homes, might as well have nice climbing brushes and gear.