Taking a break from coasters because many people don’t want them the thickness we provide and aren’t reading dimensions here. We get complaints about the thickness but they will be 1.25-1.5 inches high and are in our shop to see sizing. 
Please be sure to read all terms and conditions regarding resin. 
For coasters, we decide flowers and placement for the project, as sizing severely limits the design. 
Coasters are thick to accommodate full flower look (ABOUT 1.25-1.5 inches). 4 inch in diameter. 
Resin is a patient work of art. Every piece is different. We do our best to smooth edges and avoid bubbles, but these traits are part of the art in many cases.
We use a casting resin with UV protectant but heat and sun exposed can cause yellowing.