The Barell Springs Soft Version 1.0 is a competition-oriented spring designed to prevent large body rolls and retain the load applied, providing a solid and controlled feel. It is manufactured in Japan and is now available in the USA. The EdgeFlex Spring is characterized by its excellent balance of "kick-off" and "load-bearing" during drifting. Version 1.0 is designed to maintain load without being repelled, even when using soft oil.

The spring is recommended to use as a front and rear set for significantly different characteristics compared to general ones. It is also advisable to use it without applying preload initially. For lightweight chassis like the RDX, the 8-coil (Ver.1.0) springs are recommended for both the front and rear. The spring has a length of 27mm and a wire diameter of 1.5mm. It has 8 coils.

The Barell Springs Soft Version 1.0 is a great choice for those who want to improve their drifting experience. It is designed to maintain load without being repelled, even when using soft oil. The spring is recommended to use as a front and rear set for significantly different characteristics compared to general ones. It is also advisable to use it without applying preload initially. For lightweight chassis like the RDX, the 8-coil (Ver.1.0) springs are recommended for both the front and rear. The spring has a length of 27mm and a wire diameter of 1.5mm. It has 8 coils.