An 01005 measures just 0.4 millimeter long, 0.2 millimeter wide, and 0.13 millimeter thick. A thousand 01005s weigh just 0.04 gram, and 16 of them can fit inside an 0402! The 01005 is also more expensive than its larger cousins. Whereas an 0402 costs approximately $0.004 and an 0201 costs $0.04, an 01005 costs $0.45.
Assembling these tiny, expensive resistors and capacitors presents some design and assembly challenges, particularly for lead-free products. Engineers must pay close attention to board design, component selection, stencil design, solder paste composition, board handling, printing, placement, reflow and inspection.