I bought mine online through Cake Things; they sell them by n.0, n.25, and n.5 inch sizes. I got the 6, 8, and 10 inch in the .0 and .25 sizes. I'm thinking the .0 will be sufficient, especially for ganache, but think the .25 will work well for smbc. Haven't tried them yet though. My next cake is not for a couple of weeks, I will be trying them then. Anxious to see how it goes since I have never used this method before.