These favor jars are made of clear glass in a square shape and have a cork top. There is a 1 inch round opening at the top. The jar has a 2.75 fluid ounce capacity. Features Size 2 3/4" tall 1 3/4" x 1 3/4" 2.75 fluid fluid ounce capacity square clear glass "treat" jar Made of clear glass in a square shape Cork top 1 inch round opening at the top