3.5 Inch Glass Mason Jar Ornament for Christmas Lights. 3½'' x 1¼''. The lid is removable. Decorate your tree with a larger version of our popular Mason jar ornaments! This ornament is a little larger than our original Mason jar ornament. These are the same size as our Mason salt and pepper jars. The lid features a rubber-lined hole that fits over any miniature Christmas light. The jar hangs from the light as your Christmas lights illuminate the jar. Remove the lid to add tinsel, photos, candies and more.