According to the query number.

1, shell yield is an evaluation index of buckwheat shell quality. Buckwheat shells with shell yield above 80% are called export-grade buckwheat shells, while buckwheat shells refer to buckwheat shells with shell yield below 80%.

2, breathability, buckwheat shell is prismatic, not one piece, buckwheat shell is called buckwheat shell after crushing, and its breathability, toughness and fluidity are much better than buckwheat shell.