According to Official Guinness Records,
A mere 5.6 mm (0.22 in) wide, this minuscule cube was created by Tony Fisher (UK). But despite its diminutive size, it can be operated like a normal Rubik’s Cube, albeit with the use of tweezers. The cube – which can easily be balanced on a fingertip – was produced from frosted plastic using a multi-jet modelling 3D printer. The cube was completed on 7 June 2010 and revealed on 10 June 2010.
For a complete list of 2010 records, please visit 2010 Guinness Records in United Kingdom.