Flange type, turbine (Price varies depending on size) 
T3(TD06, T67, etc)  T4(T88, T78, TO4Z etc) T25(same flange dimensions larger EX housing) T25(mainly Nissan guenuine TD05, GT28 etc)
 
Available in 4 sizes to fit different tubines, the material is the strongest wrap material and silica.
It comletely encases the turbine exhaust housing, reducing turbo lag and protecting various intenal engine parts from heat, just like other heat-resistent materials.
The mathod of fixing is to attach the round button hook to the blanket itself by crimping it in 2 places and then to 
hook the stainless spring onto it, It's simple.