These in my opinion are fabulous.I haven’t been able to find another set the same anywhere on the internet.

The centres of both are slightly hollowed out to take the caster from the piano.

There are two chips one on each insulator ( see last two photos ) the chips are on the top of the  insulators only.

 They are heavy glass weighing 960 gram combined weight.

Width 8 cms height 5cms.

Thank you for looking