Its members were Illy Bleeding (Jaime Keller), Dennis Sanborns (Walter Schmidt), This Grace (Carlos Robledo) and Dean Stylette (Alfonso Moctezuma).
[5] Lead vocalist Jaime Keller Cortina, known under the pseudonym of Illy Bleeding, arrived in Mexico in late 1977 after living and studying in Toronto, Canada.
Upon arriving in Mexico, Keller became aware of the censorship of Mexican rock by the Institutional Revolutionary Party, resulting in the band playing at hoyo fonky [es] concerts and gay bars at that time.
In a 2012 interview for the radio program La Ruleta, Walter Schmidt comments on the origins of Size:[10] "And since Decibel had disbanded, we were a little disappointed because there has never been much following for experimental music in Mexico, so we started to do something more... well, not exactly commercial but more accessible that was like punk/new wave that we did, also with very electronic things and little noises (...).
After the dissolution of Size following a concert in Cuernavaca in 1985, Walter Schmidt and Carlos Robledo joined Ulalume Zavala and Humberto Álvarez to form the synthpop group Casino Shanghai, in which they recorded the album Film.