Rug warps are made either from Finnish seine twine or polyester yarn. Colour options for seine twine are off-white, linen and black and for polyester warps: grey, beige and black. 90 cm rug warp is made from 12 thread twine (30 × 12 tex) and the wider warps are made from 15 thread twine (30 × 12 tex). Width has been calculated for reed 20/1 or 40/1. Warps have four added threads on sides.