The new design PROTUBE has been improved both in durability and variety to provide even better value at the same market leading price. Available in 4 strengths. Care should be taken not to over stretch the tubes as this will cause them to split. Please note care should be taken to avoid sharp objects on the bottom of shoes do not come into contact with the tube as this will also cause damage. Buy a door anchor to accompany this product for just £5.00.