30 DEGREE: 30 blades are predominantly used for cutting very thin window tint and mylar materials. 45 DEGREE: 45 blades are the standard blade that comes with most vinyl cutters. They are recommended for all standard cast and calendered vinyls as well as other thin materials. 60 DEGREE: 60 blades are recommended for thicker materials such as reflective films, flock and twill materials and also sand-blast resist. High hardness, come with springs and blade holder base. 10 pcs for each degree.TOTAL 30 Graphtec blades. APPLICATION: The Hard Alloy Cutter Blades are with fine polishing process, suitable for mahogany, vinyl sheet,wood,silhouette cameo, faux leather,PVC color board, MDF and other precision relief.Compatible with Graphtec CB09U CB09 Cutting Blade Holder. NOTE: Graphtec cb09 blades came with NO instructions. please do internet search and watch a few YouTube videos.Looking on YouTube will give you all the information you need to set graphtec blade up.