Size of the telescopic cup: 

small 75ml (base 50mm telescopic 13mm cover height 12mm cup mouth inner diameter 46mm stretch height 58mm cup bottom inner diameter 33mm) (size is subject to actual, each person has slight error, only for reference)

Medium 140ml (base 65mm telescopic 32mm cover height 31mm cup mouth inner diameter 59mm stretch height 75mm cup bottom inner diameter 46mm) (size is subject to actual, each person has slight error, only for reference)

Large 240ml (base 78mm telescopic 29mm cover height 28mm cup mouth inner diameter 74mm stretch height 88mm cup bottom inner diameter 57mm) (size is subject to actual, each person has slight error, only for reference)