GBC 2515657 Proclick Classroom Binding Kit Refill, Blue/Navy, 25 Spines, 50 Covers ProClick classroom binding refill kit includes 50 prepunched translucent blue gel covers, 25 navy blue 1/2"-capacity spines, six binding tools and instructions. Stock up and be ready for class projects. Refill kit includes 50 prepunched translucent blue gel covers, 25 navy blue 1/2"-capacity spines, six binding tools and instructions. Stock up and be ready for class projects. Refill kit includes 50 prepunched translucent blue gel covers, 25 navy blue 1/2"-capacity spines, six binding tools and instructions.