This is a great resource to refer to if you are thinking about incorporating more manipulative's in your classroom. In this PowerPoint, I include the definition of a manipulative with a visual, and also some great books with activities using manipulative's. I would strongly encourage this PowerPoint if you are trying to grasp the concept of manipulative's or need some guidance on how you can incorporate them with reading and math! You can also use it to explain to the students what manipulative's are. There are some great concrete examples (with bright visuals) that would help them understand a little easier.
I hope you enjoy!