For the construction of our hand models our modellers use surgical scalpels from Swann-Morton. We recommend scalpels No. 24 and No. 10. Scalpel No. 24 fits handle number 4, No. 10 scalpel fits handle No. 4. The handles are made of durable stainless steel and will last many years. The scalpels are sold in a pack of five. These scalpel blades are great for building our resin kits.