supply of each cartridge contains- mixture of 50% [each cartridge contains- mixture of 50% human neutral insulin & 50% human isophane insulin in concentration of 100 iu/ml ,packed as 3 ml cartridge(one pen and ten needle supply with every 50 cartridges-free of cost)]each cartridge contains- mixture of 50% [each cartridge contains- mixture of 50% human neutral insulin & 50% human isophane insulin in concentration of 100 iu/ml ,packed as 3 ml cartridge(one pen and ten needle supply with every 50 cartridges-free of cost)],each cartridge contains- mixture of 50% human neutral insulin & 50% human isophane insulin in concentration of 100 iu/ml ,packed as 3 ml cartridge(one pen and ten needle supply with ev ery 50 cartridges-free of cost) ]