Martingale Collar or Quick-Release Buckle! A doggy's been here and left his print. Green polka dots floating on a deep brown with pawprints of a familiar kind, this collar is fun and functional. Machine wash cold separately or with similar colors. Place item in a lingerie bag to keep the hardware from clanking around your washer. Line dry. Do not iron. Available in 1.5" width only in three sizes: Small-10-15", Med-15-23", Large-19-30". Materials:Die cast nickel plated hardware and Quick release hardware is a combination of acetal, polypropylene & Nylon webbing. Polyester trims.