LEGO Transparent Light Blue Rock 4 x 4 x 1.6 Bottom (30294 / 42291)

LEGO Transparent Light Blue Rock 4 x 4 x 1.6 Bottom has been used in at least 13 LEGO sets over the past 10 years, since it was first used in 2014. You can also find this part in at least 13 other colors. It has the design IDs 28696, 30294 which can usually be found molded into the bottom of the part.

• Boulder