4" Toilet Seat Riser: Our toilet seat riser elevates the toilet by 4" / 100 mm, providing a comfortable toilet option for expectant mothers, the elderly, and injured individuals, reducing joint strain and meeting the needs of the whole family. Opening Size: 10.43 x 8.27 in / 265 x 210 mm. The width of the toilet bowl's front rim must be less than 2.87 in / 73 mm Dual-Sided Knob Installation: This toilet seat needs to be installed above the toilet seat cover. The locking devices on both sides require almost no specific toilet shape, making installation and removal a matter of seconds. High-Strength Plastic Construction: We use high-strength PP material, ensuring strong weight-bearing capacity and safety for users of various body shapes and weights. Additionally, this material is resistant to staining and can be easily cleaned with a wipe. Sturdy Structure: We have designed smooth curves and wrap-around base support on the toilet seat, ensuring a stable and steady sitting experience. Easy to Open: With a toilet seat cover to help isolate toilet odors, our design allows for easy opening, minimizing the need for hand contact.