A sturdy 1/4" thick Skeewbacker base, can be hand washed. 3" x 9" x .25"
Use thinset or silicon glue for adhesive. Treatment for edges:
1) paint the edges and back with either latex or acrylic paints. No paints with solvents as that can warp the board.
2) You can thinset the edges
3) You can grout the edges
Watch the "How to Shape it" video. Easy and fun.