the wooden ball helps you give the dog extra line helping with less friction 

the line itself is soft and 6mm thick 

The Trixie Rope Long Line Tracking Dog Lead is a high-quality, durable accessory for training and obedience purposes. Made from strong nylon material, this 15m long lead is 6mm thick and features a sturdy ball at the end. Suitable for medium-sized dogs, it allows for precise control and recall during walks or training sessions. The sleek black colour adds a stylish touch to your daily pet supplies, making it a must-have for any dog owner looking to enhance their training routine.