Patterned papers are essential for origami models, especially if they are modular. They can add that little extra that makes the difference between "nice" and "wow".
This classic pattern is also one of my favourites. The diagonal stripes make it look like a classy fabric and the stripes are good for effects. Even a classic sonobe ball gets something special with this paper.
In each package there are 32 sheets just enough for a standard kusudama with two papers spare to practice and experiment. The paper can also cut into four. Most kusudama artists actually prefer the 7.5×7.5 cm format over the big 15×15 cm. In fact you can quadruple the number of kusudamas if you go the extra mile of cutting the paper. The thinness of the paper guarantees that the paper is still thin enough for precise folding.