seaHorse 2.0 weblock



Our new seaHorse is the most sophisticated weblock on the market. Made from a single block of aircraft aluminium, and full of innovative features!

Special Price €89.95 was €109.95
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The seaHorse is the newest piece of gear innovation by SLACKTIVITY. We spend more than 2 years of development to reinvent the weblock. We started the design process with the intention to create the most versatile, lightweight and trustworthy weblock possible. Efficiency while pretensioning was one of our key points, as we are a big fan of using a HangOver pulley system. The seaHorse is forged from a single piece of aircraft aluminium, which allows it to be really strong and safe. The end result is astounding, and we can safely say that this product is a huge innovation on the slackline market!


Key features and innovations

The biggest innovation is the hollow center diverter. The hollow center diverter allows a variety of soft connections. This can be really useful when building a HangOver pulley system, attaching a regular pulley system, or attaching a rope to train for highlines in the park. We even built in some ‘grooves’ that keep your soft attachments in place instead of sliding up.

The geometry of the seaHorse is optimised for the most efficient pretensioning possible. A lot of testing with a big modular plate has led to the perfect dimensions for a HangOver pulley system. To see how to create the lightest 15:1 system on the market, you can watch the video above!


Another key feature is the 'snout' of the seaHorse. We noticed that with the low-tension trend the last few years, that both the mainline and tail can exit the weblock when not being careful. The snout prevents that, and keep your webbing and tail perfectly stacked and aligned.

The seaHorse comes in two versions. One with two 4-ball locking pins, and this version with a single 4-ball locking pin and sewn end-loop. This version is perfect for a direct shackle connection to your seaHorse, and is 30 grams lighter. Both versions come with a sewn end-loop.



  • Weight: 300 grams
  • Working Load Limit (WLL) 12kN
  • Minimum Breaking Strength (MBS) 60kN
  • Center diverter diameter: 36mm
  • Inner diameter center diverter: 23mm
  • Comes with sewn endloop with an MBS of 36kN
  • Made from a single piece of aircraft aluminium(7075-T6)
  • 4 ball locking pin made from 17-4PH steel
  • Sandblasted outside surface for better grip
  • Pin connection cord to not lose your pin!
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