Size of a play item usually denotes the difference between play items and "pack n' plays, so Gramma recommends checking the spec pics. Quick Specs 

Shaft Specs (L x g)

Cervelot Shaft = 4.4 x 4.5" (1.4" diameter)

Boerewors Shaft = 5 x 5" (1.6" diameter)

LauLau Shaft = 5.5 x 5" (1.6" diameter)

BF 2.0 Shaft = 6.5 x 5.5" (1.75" diameter)

Currywurst Shaft = 7" x 6" (1.9" diameter)