Vintage Mid Century Set 6 Lucite Acrylic  Made By EPC Estok Plastic Company Trenton New Jersey. Inside circle is 2&3/4'' So the base of your glass can't be bigger than that.   Each coaster measures about 4x4 inches.  Includes a Lucite/acrylic box that holds the coasters on a Lucite pole.  VERY GOOD condition, no chips/cracks, modest use wear, holder has some age scratches A couple show more wear on the cork than others.