Skulls glow in the dark! Pattern placement may vary. BowTies are the perfect accessory for any occasion! Our BowTies measure approximately 4" x 2" and attach to your dogs' collar with a velcro strap. They can attach to any collar 3/8" up to 1", any style (side release, buckle, martingale, combo, hound). You can cut the velcro strap if needed for smaller width collars; it will not fray.