Layer 1: 6 inches -15 cm

Layer 2: 8 inch -20 cm

Layer 3: 10 inch -25 cm

Layer 4: 12 inch - 30 cm

Layer 5: 14 inch -35 cm

Layer 6: 16 -40 cm inch

Layer 7: 18 -45 cm inch
Interlayer: 10 cm， thickness 5mm disk