This is amazing value: it is a reprint of an original 14 volume set there has been condensed into seven 2-3 inch thick hard back volumes. They were reprinted in 2007 by Baker Books, a complete and unabridged version of a 1872 set. You should beware of any other John Wesley set that may be abridged. The quality of reproduction is very good and provides a very low cost and comprehensive collection.
The product description should read as follows:
The most complete collection available of Wesley's works! The writings in these volumes include Wesley's comments on more than 4,000 subjects, hundreds of personal letters, his complete journal, homiletical pointers, scores of addresses, sermon resources, and an extensive subject and Scripture index. Originally published in 14 volumes. 7488 pages total, seven hardcover volumes.