WHEELS: Includes two 4" stationary wheels and two swivel wheels for maximum maneuverability. The swivel wheels feature a locking mechanism to keep your crate stationary when needed.. pSTRAP: The included strap is designed for easy transportability. Use it as a side strap to carry your folded crate over your shoulder. Or use the strap to pull your upright crate with the wheels attached.. pRESUABLE ZIP TIES: 8 reusable zip ties let you "lock" the crate sides and doors in place for airline travel or to offer extra support when transporting your pet in a vehicle.. bFeatures /b ul liDesigned for use with the Medium or Large Mirapet Collapsible Crate; liThis travel kit allows you to safely take your pet wherever you go; /ul bSpecifications /b ul li bSize: /b Medium & Large; /ul.