It is top quality filters.
Good optical glass that does not badly affect sharpness as cheap filters do.
Very consistent color among all filters.

No IR contamination that can result in horrible color shifts, especially for stronger ND filters.
Comes in very good padded packets.
3mm thick, so works perfectly with cheap matte boxes.

Available at: ND 0.3, ND 0.6, ND 0.9, ND 1.2

Make sure to check feedback at http://www.personal-view.com/talks/discussion/8942/skier-hotmirror-4x4-4x5.65-filters-discussion/p1

It is top quality filters.
Good optical glass that does not badly affect sharpness as cheap filters do.
Very consistent color among all filters.

No IR contamination that can result in horrible color shifts, especially for stronger ND filters.
Comes in very good padded packets.
3mm thick, so works perfectly with cheap matte boxes.

Available at: ND 0.3, ND 0.6, ND 0.9, ND 1.2

Make sure to check feedback at http://www.personal-view.com/talks/discussion/8942/skier-hotmirror-4x4-4x5.65-filters-discussion/p1

Top quality CPL filters.
Made from special optical glass that does not affect sharpness.

Comes in very good padded packets.
3mm thick, so works perfectly with cheap matte boxes.

Available at 4×4 and 4×5.6 sizes.

Top quality UV IR filters.
Made from special optical glass that does not affect sharpness.
AR coated to decrease the IR pollution and increase light transmission.
Made to work with your PL or ND filters.

Comes in very good padded packets.
3mm thick, so works perfectly with cheap matte boxes.

Available at 4×4 and 4×5.6 sizes.