Handmade building blocks. Made from natural Japanese cypress, they have a very gentle feel and are lightweight. Each block weighs about 4g, though there may be slight variations. The corners are a little sharp, but they shouldn't be too painful unless pressed hard. (Individual experiences may vary...) Please be careful of choking hazards for children. Children around 2-3 years old have been playing with them♩ As they are natural wood, occasionally there may be wood grain? present. They feel a little rough. (See photo 4) Why not use them for building block play or as part of pretend play?? ( ´ ▽ ` )