Ardo Individual Set (single size 28, 31 & 36mm) The standard ARDO PumpSet is supplied with a single Ø 26mm breastshield. The IndividualSet shown here comprises an XL Ø 31mm breastshield, a large Ø 28mm insert and an XXL Ø 36mm breastshield. In the UK, the ARDO Calypso and Amaryll breast pumps are supplied complete with Ø 26mm and Ø 31mm breastshields, plus a Ø 28mm breastshield insert. This set allows Calypso / Amaryll owners access to the largest available Ø 36mm breastshield. Please take a few moments to read our brief explaination of ARDO breastshield sizing.