A life-line ridge is a bump on the left side of the palm area of the grip. This helps with precise placement of the hand as it “pops” into place.
The main idea is that the ridge is high enough to make its presence noticeable when placing your palm. With only 0.7mm height, you will feel it when it “snaps” in your palm’s lifeline. When on full draw, the lifeline disappears, as it is much thinner than your skin tissue thickness.
The life-line ridge is available for all plastic, glass and wooden grips.
Some models (like the I AM grips) do not have an option to add a lifeline. This is because the inner edge (left for right handed archers) is sharp enough so it works in the same way for the placement of the palm.
Here’s what you need to know about the recent changes:
While new import tariffs have been introduced, they only apply to orders shipped to the USA if the total value exceeds $800 (including postage).
This means all orders under $800 will continue to pass through customs without any additional fees or charges.
Our workshop is based in Greece, so shipments within the EU are not affected. For all non-EU countries, import conditions remain the same as before.
You can read more here: 
https://rcore.co/possible-taxes-for-non-eu/
Keep shooting and enjoy your archery journey with us!
Thank you for your continued support!
— The RCore Team