Check the listing for details. Benjamin Akela scope rail support 3d printed. Condition: New. Listed at 12.80 USD. These are Support bands for the Benjamin akela scope rail to help alleviate the drop and movement the rail can have 3d printed in Black Carbon fiber reinforced polycarbonate material 100% fill and solidincludes band and m3 Allen head screw and nut to affix.This is intended to correct rail droop and movement that can happen and keeps the rail equal heightInstructions, From split gently open and slide to the desired position over the barrel you may have to lift gently to clear the tube rings Place under forwarding position on the railInsert the m3 screw and tighten it down to snug (the nut is affixed to aid in installation) just until the screw reaches the end of the nut I do recommend taking time as to not scratch the barrel shroud highly unlikely but in the event, I can't be held responsible.These are very durable but will break if you stretch beyond the limits of the material. I have tested and they can take quite a bit of abuse Air rifle pictured is not included and only for demonstration of the product, you will receive the barrel band and m3 mounting hardware only.all items are individually made and checked before shipment item is sanitized, defects are highly unlikely due to it being 3d printed although very high-quality prints there are very small lines very rare some bumps that are normal.