This is a complete set of 6 ivory Tupperware nesting measuring cups. They are made of plastic and have a capacity of 1/4 to 1 cup. The set includes model numbers 761, 762, 763, 764, 765, and 766. These measuring cups are compatible with universal food items such as flour and milk. They are a vintage original and have features such as nesting capability. The time period they were manufactured in is unknown.