Nanoblock Sanrio Characters Hello Kitty by KawadaNanoblock Sanrio Characters Hello Kitty by Kawada. Build your very own Hello Kitty with Nanoblocks. 140 pieces. Includes detailed building instruction booklet. Nanoblock is the original micro sized building block and is the perfect hobby toy for both older children and grown ups who want to be absorbed in a new construction project. The Nanoblock limited edition Character Pack series is a collection of micro sized building block systems that recreate