The difference between a, anti-mite, breathable, and b, moisture-proof and dirt-resistant,A section 6cm hard 3cm imported 3e brown+,A section 8cm hard 5cm imported 3e brown+,A section 10cm hard 7cm imported 3e brown+,A section 12cm hard 9cm imported 3e brown+,A section 20cm super hard 17cm imported 3e brown+,A section 7cm moderate 3cm imported 3e brown +1cm,A section 9cm moderate 5cm imported 3e brown +1cm,A section 11cm moderate 7cm imported 3e brown +1cm,A section 13cm moderate 9cm imported 3e brown +1cm,A section 15cm moderate 11cm imported 3e brown +1cm,Type b 6cm hard 3cm imported 3e brown+,Type b 8cm hard 5cm imported 3e brown+,Type b 10cm hard 7cm imported 3e brown+,Type b 12cm hard 9cm imported 3e brown+,Type b 20cm super hard 17cm imported 3e brown+,B section 7cm moderate 3cm imported 3e brown +1cm,B section 9cm moderate 5cm imported 3e brown +1cm,B section 11cm moderate 7cm imported 3e brown +1cm,B section 13cm moderate 9cm imported 3e brown +1cm,B section 15cm moderate 11cm imported 3e brown +1cm,C section 6cm hard 3cm imported 3e brown+,C section 8cm hard 5cm imported 3e brown+,C section 10cm hard 7cm imported 3e brown+