These are Ddrum's interpretation of Tama's octobans. They are very well constructed (actually, better than the Tamas), and sound a little bit more modern than Tama's (they include a bearing edge where Tama doesn't, etc). They come in sizes ranging from 6 inches in depth to 24 inches in depth. I chose the two smallest ones because they are the cheapest ($169), and I have limited space.

They sound great, and for the price cannot be beat. I wouldn't recommend the Tama ones after hearing both of them in person.