High Quality Ninja Senban.
Originally these items where a carpenters tool called Kugi Nuki (nail puller). Used by Togakure Ryu Ninja for Senban Nagejutsu Togakure Ryu Ninja would carry 9 Senban at a time Koto Ryu Koppojutsu also uses these and they are called Teppan.
Comes in a set of 3. Senban finish or color might be a little different then the picture above because they're all hand made but will still be the highest quality senban.