Slackibloc 4.0 (banana) In stock


The weblock for slackline webbing (banana). Light and user-friendly, made in France, for all your longlines!

Weblock ? Banana ? What is this ?

Banana is the common name given to webblockers in the slackline world. It replaces the sewn loop to setup your slackline.

The origin of the name banana simply comes from the first models, because they strongly resembled to... a banana!
Today we can find a little bit of all shapes :-)

The weblock (or banana), allows you to adjust the length of the slackline you need to setup. If you have 43m between your two trees and that you have a slackline of 75m, no worries!

Thanks to the weblock, you will be able to adjust the length to attach your tensioning system.

Contrary to the Linelock, it has the advantage that you can swallow the slackline directly (pre-tensionning). Very practical to use!

The SLACKIBLOC 4.0 is a strong and ultra-light banana for longline. Its hardened aluminium body allows a working load of 10 kn (50 kN breaking load) for only 165g.

Technical specifications

  • 25 mm large webbing locker = for thin webbing
  • Weight : 165g
  • The Slackiblock has an anodized aluminum diverter which distributes the energy on the webbing's surface;
  • The inox 17-4PH makes a working load limit at 10 kN possible and provides a safety factor of 5:1
  • Composition : Tempered aluminium - very resistant to shocks and corrosion
  • With the ball-lockpin system the webbing is easily blocked and secure in the weblock.
  • Breaking Load : 50 kN
  • Working Load : 10 kN

Using advices 

  • The Slackibloc is compatible with basically all standard types of connectors.
  • We recommend 2,2T BOW SHACKLES WITH CAPTIVE PIN, one of the most efficient shackle.
  • To use on slacklines longer than 50m. Below this length, a line lock is still suitable (attention to the tension force), but the weblock will be easier to pre-tension the webbing
  • On high-tech webbing such as our "Moonwalk", it will necessary to use the double wrap method (see video below)
  • Each webbing has his own resistance into a weblock. To know the just resistance of your webbing with the Slackibloc, go to the webbing page and have a look at the "technical specifications" section


  • The Slackiblok is not a PPE equipment
    Please read carefully the user guide before use
  • Wide webbing (>25 mm)
  • Small shackles (less than and 10mm shackles)
  • Delta quick link (less than and 10mm shackles)
  • Freestyle : Jumpline/Trickline, for this buy the Andy Lewis kit

Weblock set up

How to determine the tension in your slackline ?

  • Our spreadsheet :
    Thanks to the following sheet, you will be able to approximately know the tension into your gear (slings, shackle, slackline, etc.). You will then know if you are using it correctly, meaning correctly regarding the using advices and most important the strength limits.

    Click there to see the sheet and enter your datas

  • The dynamometer or Linescale
    This product allows you to mesure exactly what is the tension into your equipment.
    For more informations click there.


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