A 28-Inch Inflatable Ninja Sword The classic Japanese katana is a historical and theatrical icon, with a strong presence in comics of all sorts. So, it only makes sense that someone would made a very realistic looking inflatable ninja sword like this 28-inch model. It’s colored to look like a katana sword with a yellow hilt and a red stylized handle. A 28-Inch Inflatable Katana For Parties & Carnivals No party or carnival is complete without find prizes. This plays well for the iconic image of the katana in the form of this inexpensive inflatable 28-inch ninja sword. It’s easy to blow up, its cool to look at, and kids can even play sword fight with them without worrying about someone actually getting hurt.