The twenty bead version, referred to by its Dutch name rekenrek ("calculating frame"), is often used, either on a string of beads or on a rigid framework.
ðə twˈɛnti bˈiːd vˈɜːʒən, ɹᵻfˈɜːd tə baɪ ɪts dˈʌtʃ nˈeɪm ɹᵻkˈɛnɹɛk"kˈælkjʊlˌeɪɾɪŋ fɹˈeɪm", ɪz ˈɔfən jˈuːzd, ˈiːðɚɹ ˌɔn ɐ stɹˈɪŋ ʌv bˈiːdz ɔːɹ ˌɔn ɐ ɹˈɪdʒɪd fɹˈeɪmwɜːk.