the halo hair extension with wire,lighter and more comfortable without clips ,and really easier to apply and remove without any extra help in a few minutes.Material: Synthetic High Temperature Fiber(Heat Resistance: 300H-350H or 150-180 ) ;Length: About 12'' 14" 16" 18"(when it curl );Weight: About 3.5-4.2oz;Width: Approx 11";Colors tip :Color may vary by monitor,select the similar color based on your tail,it will look more naturally.Adjusting the size only requires pushing and pulling the transparent wire without other tools help.Unlike yourself hair,the hair extension may get tangled without nutrition,use detangle spray, if no conditioner,just spray some water,It will make the hair extensions not very dry and prevent getting tangled in some extent.Unlike the traditional clip in hair extensions, this new hair is lighter and really easier to apply and remove without any extra help in a few minutes.