AL-4 Anchor Links from Peak Design allow you to quickly and securely attach and detach most standard camera straps from your camera. The AL-4 anchors will indicate when it is time to replace your anchors. The outside sheath of the anchor is black, the middle sheath is yellow and the inner sheath is red. When you start seeing yellow, it's time to replace your anchors. Two Links for the strap are included, as are four Anchors that attach to your camera. Photographers will appreciate the thicker cord that distinguish the AL-4 from earlier versions. The AL-4 is compatible with Peak Design tripod plates.