Klip K-Boom 18 (1.20) vs Tourna Black Zone 17

Measured, side by side

Bars are percentile against all 791 strings, and the marked side is the one that measures better, which is not always the one you want. A firmer bed is worse for your elbow and better for your control, and no measurement knows which of those you came for.

Which one wins, by problem

Each string's standing on the site's rankings, out of every measured string in the database. This is where a comparison stops being arithmetic and starts being a decision.

• More spin and shape

  K-Boom 18 (1.20)137th

  Black Zone 17147th

• Easier on my arm

  K-Boom 18 (1.20)388th

  Black Zone 17353rd

• More control, less launch

  K-Boom 18 (1.20)327th

  Black Zone 17410th

• More power and depth

  K-Boom 18 (1.20)423rd

  Black Zone 17345th

• Plays the same for longer

  K-Boom 18 (1.20)419th

  Black Zone 17408th

• Lasts longer before it breaks

  K-Boom 18 (1.20)175th

  Black Zone 1751st

• Best feel and touch

  K-Boom 18 (1.20)399th

  Black Zone 17338th

Swapping between them: what tension?

Bed stiffness is published at one reference tension, so the only honest conversion is to scale it. These are starting points from 52 lb, not prescriptions. The calculator takes your own tension.

Hybrid: what if you used both?

Estimated, not measured. No hybrid combination has been tested as a bed. These figures are the two strings' own lab measurements weighted by how much of the bed each one actually is. Treat them as a guide to which way a pairing moves, never as lab data.

Open this in the hybrid builder

Which goes dead first?

Estimated from tension loss, which is the only thing the database measures about ageing. This is when the bed stops playing the way you strung it, not when the string breaks.

Both strings in full

Add a third string K-Boom 18 (1.20) in full Black Zone 17 in full