Durable and functional: Made of material, these spring fin straps are built for longlasting use during scuba diving. Corrosionresistant stainless steel: The spring laces are made of 304 stainless steel, resistant to seawater erosion and rust. It offers toughness and durability for underwater use. General compatibility: Suitable for fins from brands such as CRESSI and Mares, and can be used with various fin models. Please ensure the size of the base of the fin buckle matches within 1MM of the original buckle for compatibility. Not suitable for coco fins. Use scenarios: On regular scuba dives to worn or incompatible straps on fins from CRESSI or Mares. In saltwater environments to benefit from corrosion resistance and extended strap life. While traveling or using rental gear, compatible with multiple fin models as long as the base buckle size matches within 1MM of the original.