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This shrill ear killer whistle is 8mm wide x 57mm long with a 6.35mm ID hole (1/4" drill bit). It is UV reactive wood from a Japanese Barberry bush.
Japanese Barberry (Berberis thunbergii) is invasive in most places and is normally found in landscape. You can usually spot it because it has reddish leaves and narrow slender thorns. When it isn't in someone's landscaping it will be in the woods and shadier areas near the woods where it can get some sun and shade. The wood tastes very bitter. The wood is not a hardwood. You can make some neat small items with it. In direct sunlight, which has lots of UV, the wood practically glows bright yellow. Most wood workers use it to make inlays.
If you use this wood, you'll need to make sure you season it first. Do that by cutting the bush off at the ground or digging up the entire plant then letting it dry as is. If you try to cut it up into pieces before it has seasoned it will split and check like mad. Once fully seasoned you can strip the bark off easily using the blade of your knife without cutting the bark. Just angle the bladed away from the direction you use to stroke down the limb. The xylem will be brighter than the wood when the branch is green and unseasoned. Although, the xylem will begin to turn a darker color. The rest of the wood remains vibrant yellow and UV reactive. There is a tiny pithy center about the diameter of a stickpin to the diameter of a pencil lead. Branches are never very thick so seasoning times are quite short (few days). The base of the plant at the root crown will have the thickest diameter wood and longest seasoning time.
You can make a powder of the UV reactive sawdust and use it in clear glue/epoxy for various decorative things. Much like you'd add glitter to either for crafts. Shaping is very easy and so is sanding. Due to the bitter nature of the wood, I'd not use it for eating utensils like chopsticks unless you seal it properly. If you turn it, you may need to stabilize it first.
