Accordion design for easy fit on all wrist sizesWaterproof, sweatproof, latex-free TPR materialAdditional integrated key slot for flush key holdMicroLock S-Biner has polycarbonate body with stainless steel gatesMicroLock S-Biner holds up to three keysSimple twist-to-lock MicroLock S-BinerDimensions: 2.56" x .5" | 65mm x 12.9mmWeight: .3oz | 9g