Starter set expands virtualy without limits in 10-sleeve increments with extension module dbl5698 (sold separately). Two viewing angles, 30 and 60. Weighted desk stand with non-slip rubber feet. Includes desk stand, 10 sleeves and 10 snap-on tabs. Two each: black, blue, green, red and yellow; includes snap-on tabs. Extension set: dbl-569800. Rack style: reference; material(s): polypropylene; sheet capacity: 20; number of compartments: 10.