Growing up we called these brillo blocks. But I guess now they are called Krinkle Blocks.
They are a huge hit in our house. These are great blocks, especially for young children- ages 2+ (Since they have bristles- that keep creations together- they are not easily knocked over.)
This is a great set for less than $15. I probably have two sets worth of blocks, and your imagination is the limit to your creations with these blocks!