Hi Del, The Chickering 507 is MDF board on the lids. All Japanese products are MDF as far as I know, it gives better stability to the polyester finishes, an engineering compatibility choice, with the very gloss on the majority of their instruments, it prevents planking show through, which is inevitable at some point with cross band construction. Regards Roger Roger Jolly Balwin Yamaha Piano Centres. Saskatoon/Regina. Canada.
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