This Exercise Pen Is Offered In 5 Different Models, Heights. All Models Come With 8 Panels. Each Panel Is 2 Feet Wide. Because Pets (Dogs, Rabbits, Ducks, Etc) Have Different Heights, These Exercise Pens Also Come In 5 Different Heights From 2 Feet To 4 Feet Tall. Mesh Size Is 1 1/2" X 6", The Wire Material Is A Hefty 9 And 11 Gauge. The Black Series Exercise Pen Is Simple To Set Up, And Requires No Tools. It Is Covered With A Long Lasting E-Coat Finish. Pet Exercise Pens Can Be Set In The Standard Octagon Design Or If You Are Going To Choose A Top, In A Square Configuration. The Black Series Includes Ground Stakes, For Added Stability, As Does The Silver Series. The Black Series Does Not Come With Corner Stabilizers, The Gold Series Does.