COTO N20, si, Sil w/PTFE bg, 40°, 3,0 mm (1xPK)
https://www.manchesterbeacon.org/shop/rw2-702839-coto-n20-si-sil-w-ptfe-bg-40deg-30-mm-1xpk-333943
https://www.manchesterbeacon.org/web/image/product.template/333943/image_1920?unique=b3cd3d5
This COTO is guaranteed a N20, with the use of si, Sil and directly supplied to your lab by Gentaur's warehouse.
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Shipping: 2-3 Business Days