1:The strap is a combination of nylon and leather, waterproof, sweat-proof, soft and comfortable. 2:Applicable model: Compatible with Casio AE1000/1100/1200/1300 W-218H W-S210 W-800H W-216/210/200 AQ-S800 AEQ-110 SGW-300/400/500 F-108 MWR-200H MWR-S300, etc. 3:Bandwidth: Interface size 18mm, the specific size see the detailed picture. 4:Here's what you get: a set of straps, a tool and three spring bars. 5:After receiving the strap, please do not rush to install, first compare with your original strap and dial, determine the appropriate, and then install. If you have any questions, please feel free to leave a message to customer service, customer service will reply to you within 24 hours