FYSETC 3D Printer Leveling Parts Heat Bed Silicone Solid Mounts Column OD 0.63 in ID 0.16 in Stable Hot Bed Tool Heat-Resistant Silicone Buffer for Ender 5/ Pro A8 Wanhao D9 Meg,4 Pack Brown https://www.amazon.com/dp/B07MKQGQJW/ref=cm_sw_r_apan_glt_fabc_T2HPX1P32ZXPD3WH5S0G?_encoding=UTF8&psc=1

Here is a link to some on Amazon. However I am in China so I got mine on taobao. They are just little silicone barrels that replace your current bed springs.

https://www.amazon.com/FYSETC-Leveling-Silicone-Heat-Resistant-Anycubic/dp/B07MKQGQJW