(1) Hair length: about 22" ( 50cm-60cm ) when folded, about 100cm-120 cm when stretchted. Full Head: Usually 40-60strands for full head, and you could select more if you want thicker hair. 3) Weight: 4-5g / strand; 40-50g / 10strands; 80-100g / 20 strands; 160g-200g / 40 strands.