Purchase Qty. Reference FOB Price
1,000-1,999 Pieces US$6.00
2,000-4,999 Pieces US$5.00
5,000-5,999 Pieces US$4.00
6,000+ Pieces US$3.00
Product Description
When a person inhales normally, the diaphragm contracts and the external intercostal muscles contract. When you inhale hard, you also need the assistance of inhalation auxiliary muscles, such as trapezius and scalene muscles. The contraction of these muscles makes the chest broad Lifting, the chest ...