I bought them about 7 years ago from Amazon. For a bed. They're similar to the ones in the attached link. But there are some better looking ones on Amazon now for thin furniture legs I would use them if I were to buy now.

https://www.amazon.com/dp/B07K39B2XF?pd_rd_i=B07K39B2XF&pf_rd_p=82f50399-f746-4975-a775-d7312e58a278&pf_rd_r=JEZTVWAVG6E9SDP6GNDJ&pd_rd_wg=elVk1&pd_rd_w=skAPT&pd_rd_r=44ffa81e-034c-4b5e-b5a8-51a1db938b35