Get the best of both worlds with convenient ProClick spines! Easy to use spines give you a professional presentation with an attractive black plastic spine, but are also easy to open for flexible editing & rearranging. Binding spines securely bind documents & let pages lie flat for 360 rotation. Spines zip open & closed to make adding or removing pages simple. Ideal for use with GBC ProClick binding machines & pre-punched paper. Sheet Capacity: 85; Spine Diameter: 1/2"; Number of Rings: 32; Color(s): Black.