€˜the irwin pro touch combi pack features retractable & fixed pro touch knifes & 10 bi metal blades. both knives feature easy tool-free entry, convenient internal storage for 5 blades, magnetic blade retention & a protouch feel for a secure grip & greater comfort. the bi metal blades feature patented technology which fuses two premium steels together. this creates utility blades that are exceptionally durable, shatterproof & last 3 times longer.