Kit de filtro FOTGA 4 X4" densidad neutra completa ND ND2 + ND4 + ND8 para soporte de caja mate

1pcs of 4"x4" Full ND8 filter for mattebox. 1pcs of 4"x4" Full ND4 filter for mattebox. 1pcs of 4"x4" Full ND2 filter for mattebox. But if you use a mattebox you can just simply pull out the mattebox filter holder and pop in this 4" x 4" filter for all size lens.

eBay