ProSelect Quality Gold Exercise Pens Top-Quality Ex-Pens Are An Amazing Value! ProSelect™ Gold Exercise Pens are simply the best value in the market today. Top-quality pens are perfect for show, travel and home use. Durable 7- and 10-gauge wire is coated with gold zinc electroplating for a long-lasting, durable finish. Narrow spacing (1 1/2" x 6") adds excellent rigidity and security with no hooks or exposed joints to injure pets. Eight strong, 24" wide panels create a spacious 16 square foot area. Two or more pens can be linked together for a larger area. Create larger areas by adding extensions or by linking two or more pens together.