To ask for help finding these coasters

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I feel ridiculous posting this but here goes...
My sister has bought her first flat. Big milestone and I asked if she'd like a gift for it. She has asked for coasters that are silent when the cup hits them (so not glass, slate etc) and don't stick to the cup either. And are a bit "special". Cork apparently, while quiet, isn't very special.
This feels like the epitome of a first world problem but I would like to try and get her what she has asked for. As a practical person whom luxury is wasted on I am at a loss, and googling sound proof coasters brings up ugly silicone ones.
Any suggestions very welcome please.

www.pylones.com/en/heatproof-mat/2135-heatproof-mat-entrechats.html

No specific suggestions, sorry, but I found some gorgeous ones on Etsy. Mine are ceramic so not suitable in your case, but you might find something.

We have these and I think they fit the criteria. I have no idea what it is they’re made of but they’re silent and I like them. You can have the separately or they fit together.

Look for some crocheted ones on Etsy

Felt coasters from John Lewis?
Or leather ones from Heals? www.heals.com/curve-coaster.html

Cork apparently, while quiet, isn't very special.

Sorry, I’ll be no help, but that’s a great line.

These?

www.contemporaryheaven.co.uk/roco-verre-real-leather-hide-retro-coasters

John Lewis do cork ones. I have them

Wood isn’t too noisy and this wouldn’t stick because of the gaps

www.notonthehighstreet.com/denversdesigns/product/honeycomb-geometric-walnut-coaster-set-of-4?DGMKT=FID__TID_aud-317724568502:pla-297068456345_PID_613026_CRI_297068456345&gclid=Cj0KCQjw3Nv3BRC8ARIsAPh8hgL6QoZkW_mf-gEZLSCwH9LTzDJJdx6pDwTkrrT8NfzkA3RK83Aub8YaApLhEALw_wcB

I had honestly never considered that coasters even make a noise before. I don't even use coasters and have to get them out when guests come and ask for them.

I was going to suggest crochet ones too.
If you look on etsy, I'm sure that you could commission some if you can't find any you like.
Of course, if you can crochet then you could make some - doesn't get any more special than that.

Oooh! I like those honeycomb ones!

The honeycomb ones are fab, unless your sister has trypophobia

Thanks everyone so far. Working through the suggestions... didn't even know you could get leather or felt coasters.

Honeycomb person has a few nice ones actually... would never have thought of wood.
The collective know-how of mumsnet is a wonderful thing.

You can get rubber or silicone ones.

Like this

www.etsy.com/uk/listing/796360356/resin-tray-and-coaster-set?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=coaster+set&ref=sr_gallery-7-21&organic_search_click=1

These are resin so should fit the Bill. You can also have them made in the colour you wish to match her colour scheme. I assume you can message the seller and ask for just the coasters if the price inc the tray is a bit high.

Sorry she also just does the coasters.

www.etsy.com/uk/listing/794313882/stunning-resin-coasters-set-of-6?ref=shop_home_active_9

We have wood ones, definitely quiet!

www.fullguru.co.uk/catalogsearch/result/?q=felt%20coasters&gclid=Cj0KCQjw3Nv3BRC8ARIsAPh8hgLv4tf9tm4zMr0FcEm3-HP9LhFAFqDYQopcMW9NhbjlsphPdJmrrL4aAvN2EALw_wcB

www-pinterest-com.cdn.ampproject.org/v/s/www.pinterest.com/amp/feltandcraft/felt-coasters-inspiration-and-tutorials/?amp_js_v=a3&amp_gsa=1&usqp=mq331AQFKAGwASA%3D#aoh=15932650579450&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fwww.pinterest.com%2Ffeltandcraft%2Ffelt-coasters-inspiration-and-tutorials%2F

Ive always thought felt or wool coasters are lovely.

Respiin for your eco points too

Leather Jack Daniels ones are nice. Wipe clean, obviously.

I like the resin ones. She says they will be "noisy".

Bamboo?