The Spectra and D4 fly almost identically (12/5/-2/2). Go with the D4 - it offers more plastic and weight options (18 blends), is easier to find, and costs less.
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FAQ
Is the Spectra or D4 more overstable?
They are equally stable (both +0) - turn -2/-2, fade 2/2.
Should a beginner pick the Spectra or D4?
Both rate the same for beginners (38/100). Pick by feel and price.
What is the difference between the Spectra and D4?
The Spectra and D4 fly almost identically (12/5/-2/2). Go with the D4 - it offers more plastic and weight options (18 blends), is easier to find, and costs less.