The Piston Pipe Size:1.5" (1.9 OD) Great for ninja and OCR

Great for ninja and OCR training

If you like swinging big and flying far

Both key types have a sling hole at the end of the key for a simple hang and swing setup

Climbing slings for slinging up all of your fancy new Stage4Designs obstacles

Check out our OAK PEGS

The Piston Pipe Size:1.5" (1.9 OD) Great for ninja and OCRA Stage 4 Designs x Ben Skraly Collaboration First unveiled at WNL Regionals 2025 as part of the legendary Piston Lane, this dynamic obstacle is now available as a standalone, bar mounted challenge. Designed through a powerhouse collaboration between Stage 4 Designs and Ben Skraly, The Piston brings a whole new rhythm to your course. Choose between two distinct models, each engineered for a different swing pattern, and get ready to fine tune your