1Made of quality materials, durable for long time use 2The stainless steel spring is high strength and resistant to saltwater, flexible for bending to fix fins 3The TPR heel pad is soft and comfortable, good for fixing the fins on your foot tightly 4The buckle is made of quality buckle, tough and durable, fits perfectly with the buckles of fins, not prone to fall 5Designed for swim fins of various brands, useful accessory for it Descriptions: Made of quality materials, wear-resistant and anti-rust, durable for long term use. Designed for swimming fins of various brands, useful accessory for it. Features: Made of quality materials, durable for long time use. The stainless steel spring is high strength and resistant to saltwater, flexible for bending to fix fins. The TPR heel pad is soft and comfortable, good for fixing the fins on your foot tightly. The buckle is made of quality buckle, tough and durable, fits perfectly with the buckles of fins, not prone to fall. Designed for swim fins of various brands, useful accessory for it. Specifications: Material: PC + Stainless Steel + TPR Color: Black Size Option: M; L Buckle Size (Diameter of slot): Approx. 20 & 14mm / 0.787 & 0.551in Length: Approx. M-31.5cm / 12.4inch; L-33.5cm / 13.2inch Weight: Approx. 352-364g Package List: 1 x Pair of Flipper Straps Noted: The buckle is applicable for fins of serval series of many bands, suitable for Cressi, Mares, but to ensure it fit your fins, please check the size of your fins, if the the discrepancy is beyond 1mm, it may be suitable for your fins.