These are special position pins which fit the Gen2 Folding Firebox Nano. (Gen1 Nano stoves can easily be retrofitted to have Gen2 capability. Here's a video which shows you how: https://youtu.be/j-s6y9rkc2g )
They have a unique shape which locks into the folded closed Nano Stove to prevent loss, and the shaped ends along with their diagonal direction also prevent the sticks from accidentally slipping out of the position holes.
Weight: 0.2 oz.