Heart Rate Monitor Elastic Strap (Small) Part Number: 010-10714-01 This replacement elastic strap (size small) allows your Forerunner's wireless heart rate monitor to fit comfortably around the chest. Compatible products for this item are: Edge® 500 Edge® 800 Forerunner® 110 Forerunner® 210 Forerunner® 305 Forerunner® 310XT Forerunner® 405CX Forerunner® 610 FR60