Attaches easily to either round or square crib rails and will not slide or pinch little fingers. Removes easily and can be placed in the top rack of a dishwasher. Package includes: 4 x 13.4” long (34cm) rail covers and 20 straps and will cover one length of a standard crib rail up to 2.6” (6.5cm) wide in diameter. Cut to size, as crib and convertible crib dimensions can vary.