Celebrate the holidays with Nanoblocks! These micro-sized nano blocks are the hottest thing since Lego. Challenging and fun for all the construction enthusiasts in the family, nanoblocks building sets lets you build in greater detail than ever before! With over 340 assorted size and colored pieces (most around .25" long and 1/8" tall), watch in amazement as your Christmas Tree takes shape. Includes detailed color instructions. Definitely not designed for children under the age of 8 years since the pieces are very tiny. Level of difficulty on this one is a 3 - with "5" being most difficult.