This Package Includes the Following Items:
1 x Alpine S-A60M Car Audio Type S Series Amp Class D Sub 1200W Amp
1 x Harmony Audio HA-AK4 Complete 4 Gauge Amp Install Kit - Nickel
2 x Alpine S-W10D2 Type S Series Sub Dual 2 Ohm 1200W Peak 10" Subwoofer
1 x 2014 - 2018 Chevy Silverado Double Cab Truck Dual 10" Sub Box Subwoofer Enclosure

Alpine S-A60M Car Audio Type S Series Amp Class D Sub 1200W Amp:
Product Details:Alpine S-Series Mono Power Amplifier - S-A60M
Power Output:400W RMS x 1 (4ohm, 14.4V
600W RMS x 1 (2ohm, 14.4V

S/N ratio: >85dB (ref: 1W into 4 ohm), >105dB (ref: rated power into 4 ohm)
Frequency Response: 10HZ-400Hz (+/- 3 dB)

NOTE: This product can only ship to addresses within the USA and it's territories

Harmony Audio HA-AK4 Complete 4 Gauge Amp Install Kit - Nickel:

Alpine S-W10D2 Type S Series Sub Dual 2 Ohm 1200W Peak 10" Subwoofer:
General Features:10" 2 ohm S-Series (Type-S) Subwoofer
Power Handling:Peak: 1800 watts
RMS: 600 watts

Frequency Response: 26- 200Hz

2014 - 2018 Chevy Silverado Double Cab Truck Dual 10" Sub Box Subwoofer Enclosure:
Features:
2014 - 2018 Chevy Silverado Double Cab Truck Custom Dual 10" Subwoofer Enclosure Sub BoxMounting Depth: 5-1/2"
Air Space: 0.55 Cubic Feet per Sub
Sealed Enclosure

Overall Dimensions: 55-1/4" L X 14-3/4" W X 9-3/4" H
Enclosure installs under the rear seat, subs fire downward
This box fits:
2014 - 2018 Chevy Silverado Double Cab Truck