Vertex Seat

I just went and measured mine. I have mine in hole 2, there are 4, and mine is about 13 inches, 20 inches I don't think, probably more like 17 ish.

Model GB1300. Vortex Rocker Rolling Seat for 40.00. I have one of each. I would say the one you are asking about is maybe one degree less sturdy than the rocker with wheels. When I use this one I tend to have to put my hands down on the ground for stability. I have mine at about 13 inches high so doable. Or grab a branch, something so it is not a big deal but the rocker one is alittle more stable. I use this one if I am sitting and repotting. I use the one with wheels if I am out in a garden moving around.

I don’t know, but I would think twice about buying it. It is very difficult to stay balanced while sitting on it.

It is not 4 inches, It is about 15 1/2 inches wide and then the short part is about 10 inches deep and the the two parts that go out -where your legs are is like 15 inches. It really is almost a circle with the indentation where you sit. The round part is where your back is so the legs go out and your core is the 10 inch part. I am 5 '6" and it is fine for me. There is a weight limit though of 220 and that is on an enclosed sheet that comes with it. So, even if you were say 5 10 but under that weight limit I think it would be okay.

It weighs about 20 ounces.

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It is about 20 inches high when it is fully extended.

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The dimensions are 11 x 15 x 15 inches ( H x W x D).