"Quality + Value = Happy teacher/kid"
I purchased these for educational purposes. Ten cubes of red, orange, yellow, green, blue, pink, white, brown, and black are included. Each 1" cube has one protruding face that can connect to every other (inverted) side of other cubes with ease. The plastic quality is good, the pieces do not stick, but connect and disconnect with ease without being too difficult (an adult could unsnap two cubes with one hand). The corners are squared, but not too sharp to cause pain. Even when squeezing opposite corners of a block, it doesn't hurt, compared to others. After 3 months of use (4 days/wk), they're still like new (strength of holding power doesn't diminish). We store them in a gallon sized zip-lock bag. For $9, this deal is unbeatable. I wish I would have found them sooner.