The Innova Viper is a VERY overstable Fairway Driver and is very similar to the Whippet.  This disc is definitely not recommended for beginner disc golfers. However, it is recommended for disc golfers who throw sidearm or flick.

The Viper  comes in the following Innova Plastics. DX, CFR

Rare Innova 90s Viper Golf Disc Rare Innova 90s Viper Golf Disc Paypal US $3.00
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innova metalhead viper first run 177g innova metalhead viper first run 177g Paypal US $30.00
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INNOVA TWO VIPER DRIVER DISC GOLF SET MEDIUM WT INNOVA TWO VIPER DRIVER DISC GOLF SET MEDIUM WT Paypal US $14.99
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VIPER 97 LOGO INNOVA ONTARIO MOLD GOLF DISC VIPER 97 LOGO INNOVA ONTARIO MOLD GOLF DISC Paypal US $15.00
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VIPER 96 FORT LAUDERDALE FL LOGO INNOVA GOLF DISC VIPER 96 FORT LAUDERDALE FL LOGO INNOVA GOLF DISC Paypal US $15.00
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INNOVA TWO VIPER DRIVER DISC GOLF SET HEAVY WT INNOVA TWO VIPER DRIVER DISC GOLF SET HEAVY WT Paypal US $14.99
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VIPER GREAT HOLES RARE INNOVA PICTURE GOLF DISC VIPER GREAT HOLES RARE INNOVA PICTURE GOLF DISC Paypal US $15.00
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INNOVA DX Viper 145g YELLOW Disc Golf 0938 INNOVA DX Viper 145g YELLOW Disc Golf 0938 Paypal US $10.99
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INNOVA DX Viper 175g RED Disc Golf 0473 INNOVA DX Viper 175g RED Disc Golf 0473 Paypal US $10.99
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INNOVA DX Viper 168g WHITE Disc Golf 0468 INNOVA DX Viper 168g WHITE Disc Golf 0468 Paypal US $10.99
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