Cellusponge-Collagen, 6-mm diameter,
https://www.ibtb.org/shop/613-cc064816-cellusponge-collagen-6-mm-diameter-15459
https://www.ibtb.org/web/image/product.template/15459/image_1920?unique=bff3db2
This diameter, is guaranteed a 6-mm with the use of and directly supplied to your lab by Gentaur's warehouse.
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