This paperweight has a spiral through it and reminds me of a helter-skelter spiraling slide, hence its name. It has air bubbles along the spiral, almost as if they are taking a ride down it. It makes a lovely decorative piece if not being used to keep papers in order.
The main picture has a twenty pence piece to help with scale, the second picture is of the other side of the weight.
The dimensions are approximately: 7cm diameter by 4.7cm tall, it weighs 455g.