This non-stretchy cotton thread is strong and durable, allowing you to warp with correct tension without snapping or fraying.
200g is a huge amount of warp - you'll be able to warp your loom many, many times with one roll.
"Warp" is the lengthwise threads of your weaving which are attached to your loom. The warp threads are the foundation of your weaving. The most commonly used material for warping is a strong, non-stretch cotton, like this!