This Arrow head is built for Larps like Amtgard.
The face of the arrow is made out of a half a ball of opencell polyurethane foam that is 2.8in diameter, two layers of XPLE one being 2lb and the base layer of 4lb.
All built upon a mechine screw base and washer with rubber bucking with a sleeve of 4lb xple foam with a Pex tube to allow it to be srewed on any arrow that has standard arrow threads of 8/32. This combination behind the washer allows it to be screwed on securely and so it doesnt unscrew due to the tension cause by the rubber bucking.
The arrow head only goes threw a 2.5in ring .5in.