Very similar in construction to the popular Crown needle, but it has 1 barb instead of 3.  They pick up only one hair per poke!  It's quite strong too.  It fits uncut into my mushroom handled rooting tool or the new wooden handled needle holder. 

ALWAYS clean the needle with rubbing alcohol before using!  The factory coats them with oil to prevent rust.  It's best to leave the factory oil on to protect your needles until just before you use them.