Raisers are included, so you can adjust the platform among 4-inch and 6-inch high of your choice Textured surface is non-slip, and shock absorbing, the surface is a slip-free, meaning you can have stability with every single set of steps Dimension: 18-inch long and 11-inch wide, height is adjustable at 4-inch and 6-inch Constructed with the durable ABS material of long-lasting. Lightweight and easy to carry, assemble and store