Michael Graves Design 4 Piece Coaster Set Michael Graves Design 4 Piece Coaster Set Stainless steel/cork. Measures 4-9/16" x 4-1/8" x 1-3/16"- Hand wash. Sleek design-polished stainless steel-nest for easy storage Crafted of polished stainless steel and lined with a nonslip cork insert, these coasters look greatand help keep your tabletops that way, too.