MOCAheart Leather Keychain. Take your MOCAheart wherever you go with this durable leather keychain, designed to hold your MOCAheart conveniently. Designed for everyday life, the MOCAheart leather keychain makes it easy to track your heart health wherever you go. Use it as a keychain or attach it to your bag. Materials: Leather Dimensions: 3.57"L x 2.14"W x 0.15"H Weight: 0.03 lbs.