Liter Measurement Set. Make the connection to real-life with translucent plastic bottles that mimic familiar water-bottle shapes. Provides concrete representation of liquid capacity measurement, equivalencies, and comparisons. Durable, sealable bottles are marked with both metric and customary units. Details: Clear Grades 1+ For ages 6 and up Contents: (1) 2 liter (1) 1 liter (1) .500 ml (1) .250 ml 1 activity guide 1 conversion tables