Clip design,easily the breathing tube to that strap or separate the breathing tube from that strap. Size: Inner diameter: 27mm/1".fits silicone breathing tube/snorkels.and portable,easy to carry and use. Pack: Includes 4 pieces clips.Color: black color.The diving tube clip retainers is very practical and helpful to diving enthusiasts. strap clip sets are,wear resistant,and,flexible and replaceable. Feature: You can twisting the snorkeling strap keeper at any direction,can be restored when released,will not be,featuring nice flexibility.