Specialty concave discs

Concave disc with 20 Waves and super-sharp edge 1958

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Disc with 24-wave concavity and super-sharp edge 1933

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Concave disc with 24 Waves and super-sharp edge 1947

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Disc with Tangential Waves 1992

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Disc with 20 tangential waves slightly concave 1957

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Disc with 20 tangential waves slightly concave 1927

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Disc with 32 waves 1926

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Disc with 5 Lobé type petals

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Flail-type disc with 5 petals

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