Rattan

Rattan is the springy bamboo-like substance used for armored combat purposes in the SCA. It is used for sword blades, and for the hafts of mass weapons, polearms and spears. It does not crack and splinter when broken, but instead tends to "mush" into a soft mass at the broken tip. [1]

Rattan can be used for cores in Belegarth weapons, but generally isn't. It must be wrapped in tape before use. Fiberglass and PVC are more common core materials than rattan.

You can get them online form pretty much any martial arts supply store such as karatedepot.com or centurymartialarts.com

shop the sites they usually sell between 22 and 28 dollars are the best use for them iv seen is a staff or double ended weapon