Although white core mats are now the standard in most commercial work, sometimes you just need a temporary and inexpensive mat.  Economy mats are "acid neutral" and are slightly thinner, .045, than standard mats They are buffered with calcium carbonate. This showkit offers a basic economy, 4 ply, cream core mat, economy mat board backer and minimal cost clear, resealable bag. The objective of this showkit is an inexpensive package for maximum volume.  Show kit is made up of one cream core mat with centered window, matboard backer and clear, resealable bag.  Economy mats are acid-neutral mats, are slightly thinner (.045) and use 100% recycled material.