Conditionally recommendable (and 50 mm is not 'small')

Cone diameter max .: 50 mm (I reduced to 43 mm - I can do that)
Neck diameter: 21 mm; Socket: 50mm x 69 mm.
Material; rubbery, very soft, smells like the plague
(You can fix this by pulling over a condom d'which also eliminates concerns regarding health risks from plasticizers), store after a month in the open: smell bearable.
If certainly not out.