This curtain rod uses a stretchable, silent runner. You can install it in the size that fits your room. Can be installed with ceilings. [Caution] This product is designed for wood mounting, so please make sure that the mounting location is a wood part with a thickness of 0.4 inch (1 cm) or more, before mounting. Do not install gypsum boards, etc. Please make sure the curtain total weight is within 5.0kg before installation.