49 squares per 10cm squared approximately.

Window sinamay, sometimes called lattice or mesh sinamay is aptly named for its appearance; the weft and warp strands are gathered in a manner to form even square spaces. 

Sinamay is the leading millinery material, in a sense it is the main fabric of the millinery world. Sinamay is woven from the processed stalks of the abaca tree, a banana palm native to the Philippines. 

Sinamay is a versatile material which can be used to create a variety of hat shapes.