【Robust Construction】ROIL Twin box spring features a heavy-duty metal frame and reinforced steel construction. It can support up to 3,500LBS, whether you're using it by yourself or sharing it with a partner, ensuring your mattress remains in optimal condition 【Round Corner Design】Box spring no sharp edges, preventing accidental contact with the legs. Safe to use 【Noise Free】The heavy-duty construction is sturdy and reliable, adopts U-shaped groove and plug-in design, so no matter how much you move or turn it over, it stays quiet and squeak-free, ensuring you sleep soundly and undisturbed all night long 【Easy Assembly】ROIL box spring designed with user convenience in mind. Featuring an all-in-one construction, comes with installation tools and instructions and can be assembled in 20 minutes by following easy to understand steps 【Easy-Clean Cover】Comes with a removable, washable fabric cover made of high quality fibers to keep your sleeping environment clean and tidy, with elastic straps and Velcro to attach to the bottom of the bed frame, shrink-proof and wrinkle-proof to prevent the mattress from slipping 【Comfort & Convenience】ROIL box spring strikes the perfect balance between comfort and convenience. The combination of comfort, strength and ease of maintenance enhances your sleep experience Combining practicality and convenience, the ROIL spring box is made of reinforced, high-quality steel for greater stability and sturdiness. At the same time and easy to assemble, use assured and convenient, no matter how to turn over and move there will be no noise squeak, bring quiet and comfortable sleep.