Foldable & Load Capacity: Our 4FT portable wheelchair ramp unfolded size: 47.64*28.35*2"; folded size: 47.64*14.17*2.76", ONLY for 4"-12" step height. The folding wheelchair ramp holds up to 800 LBS capacity. Our handicap ramps are a reliable choice for a wide range of mobility devices and users. Please note that it is normal for wheelchair ramps to sink during use, they will spring back up quickly and will not affect use. WARM TIPS: Before you make a purchase, make sure to check our size specification to choose the right size for your needs! Double Non-skid Design: The threshold ramp is designed with a black frosted non-slip layer to prevent slipping even in wet or slippery conditions. Meanwhile, the top transition plate is made of rubber anti-slip pads to prevent accidental movement and accidental fall of the home step wheelchair ramp.