[High Quality Suction Cups]Heavy-duty heart-shaped aluminum bar with 2 strong suction cups mount, load capacity 220lbs. With a proper height from your cart top or window screen. It can be accommodate to most vehicles. [Thicken Rotating Foam] With 1.1inch thickness and 14.1inch long 360 degrees smooth-rolling foam pad protecting your kayak or boat hull when loading. [Why Slight Shaking]Due to different car rear have different radian, so the specially designed for the slight shaking between the metal tube that fits inside the suction device to make the suction cup better fits the angle of the glass automatically therefore to achieve the best suction effect [Installation Tools]Installation tools is offered.Clean the rear glass with soft towel(not included) to get a better suction , make sure the kayak roller is security before using. [Easy to Use] kayak car roller can eliminate the battle for solo car-top boat loading, quick, simple, smart to load a kayak to a car top. colour: black + silver Material: sponge + aluminum alloy Size: about 36x22.5cm Package Contents: 1 x Kayak Roller 2 x Suction Cup 2 x screws Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.