AK-455 is a new enhanced formulated thermal compound that gives hi-performance heat transfer between the CPU & heatsink. Minimised resistance & maximized efficiency truly enables you to get more from your cooler. Easy to use. Ro HS compliant. Hi-performance heat transfer between the CPU & heatsink Maximum thermal conductivity, 2.4W/m K Easy to apply with spreader card Multi-language instructions included Ro HS Compliant