1x4 Technical Brick

1x4 Legocompatible Technical Brick Make sure your bed is clean as good adhesion is necessary. Please note, these bricks are a tight fit, this is done on purpose as they loosen after a few uses. Other bricks in this series: 1x24 Technical Brick1x12 Technical Brick1x10 Technical Brick 1x8 Technical Brick1x6 Technical Brick1x4 Technical Brick (This Model)1x2 Technical Brick1x2 Technical Brick (Double Side Holes)1x1 Technical Brick Boost MePlease help me progress with a boost :)Many thanks