Sterling Ropes Slim Gym 10.1mm X 200m-orange. 1mm Slim Gym is perfect for testing your indoor lead skills whether it's on a rainy afternoon or in the heart of the city. Specifications for Sterling Slim Gym: Manufacturer: Sterling Ropes Color: Orange Package Contents: Sterling Slim Gym The Sterling Slim Gym is a quality addition to the Sterling Ropes lineup. For more great deals on Dynamic Climbing Ropes by Sterling Ropes please browse our Sterling Climb page.