LEGO Technic Specialty Beams and Connectors set LB gray (18 pieces) LEGO Technic Specialty Beams set LB gray (medium stone gray) Includes 18 pieces: 1- 5x11 frame, 1- I frame, 3 beams size 4 with ball cup socket 2- 90 degree cross block beams with four pins, 1-1x3 cross block with four pins and 10 - 2x4 bent beams