Both sides of the bumper should be equipped with slide-rings since they increase its usability. The slide ring furthermore prevents the bumper from going onto the figures. Last but not least the slide ring prevents the bumper from contact with the banks. Which prevents from rubber-abrasion.
The Leonhart nylon slide ring is ideal for all 16mm foosball bars and extends the durability of the foosball men.
The metal slide ring made by German manufacturer Kickerkult. Is made out of stainless steel and can be used for all 16mm bars.