We are excited to offer our next generation coaster design. The idea is to reduce the opportunity for the coaster to stick to the glass. While it can't be totally eliminated with a really sweaty drink, it's greatly minimized with our new raised dot design. Besides, they look really cool and customized! They come in sets of 4 and are made with Horween CXL for the base layer and the raised dots are Big Grain Bison. Two color versions are available: Black CXL with Black Bison raised dots and Brown CXL with Whiskey Bison raised dots. They are very labor intensive to build, but we think they are worth it.