These are purely for decorative use. Drink can sit on them but they do not absorb moisture.
Coasters are made of FDA food safe resin and withstand temperatures up to 120c.
With any handmade item there may be slight variations. The underside of the coasters might have slight imperfections but they aren't seen once the coasters are placed.
Coasters are made with resin and glitter.
TAT is currently estimated at 7-10 business days for orders of 20 items or less, and 10-14 business day for orders of 20+.