Features: - The Black Triangle System, a new matrix system that enables black triangle closure up to 40% faster than with the original Bioclear matrices. - Black Triangle matrices are custom designed for black triangle treatment and require no trimming prior to seating. - A color-coded gauge and matrices make choosing the correct curvature for gingival embrasure closure simple and predictable. - Curvature is indicated by colors at the top of the matrix and correspond with a gauge that, when inserted into the black triangle, indicates which curvature to use.