Can this be used for indoor and inside the wall?

Yes, it can also be used indoor and inside walls.

What is the diameter of this cable? Thanks.

The diameter of the cable is about 8mm or 0.32in.

how do you strip the outer jacket without damaging the wires?

One needs a wire stripper. One can buy it at any home improvement store to auto repair store or borrow it from their neighbors. Just in case, amazon search: 2078309

Manufacturer	GearIT
Part number	GI-SPKR-14AWG-CL3-CCA-BK-100C2
Item Weight	1.88 kg
Product Dimensions	10.16 x 10.16 x 12.7 cm; 1.88 kg
Item model number	GI-SPKR-14AWG-CL3-CCA-BK-100C2
Size	14 Gauge
Colour	100 Feet - Black
Material	Copper Clad Aluminum
Voltage	30 Volts
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

GearIT 14/2 Speaker Wire (100 Feet) 14 Gauge (Copper Clad Aluminum) - Outdoor Direct Burial in Ground/in Wall / CL3 CL2 Rated / 2 Conductors - CCA, Black 100ft

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