Typical sizes in the listings: comforters about 60" x 48" or about 42" x 57"; fitted sheets commonly about 28" x 52"; flat sheets range roughly from 70" x 42" up to about 45" x 60".
Common fabric-weight designations in the listings include Lightweight, Midweight, and 'Year-round' fabric construction.
Most listings recommend machine wash and tumble dry. Several specify machine wash cold and tumble dry low, and at least one listing notes a gentle cycle.
4-piece sets typically include a comforter or quilt, a fitted sheet, a flat sheet, and a pillowcase. 5-piece sets add a standard sham or an extra pillow-style piece to those components.