This is a Cylinder Cozy from GMK Supply. This Cylinder Cozy wraps around your new engines cooling head and are used to raise temperature during the break in process. This sleeve will not only help increase the temperatures during the all important rich break in process (low temps during break in prematurely wear the piston/sleeve), but they also protect the engine head, unlike using aluminum foil. Get your engine fully broken in and looking like new when you are done!
This product was added to our catalog on December 16, 2008.
Dude it comes in a pack of one if you just got one pack then having one sleeve is correct and if you order two packs and only got one dont put that on product review because it is not the product.
rc parts reviewer
This works way better than a tire foam or sock. However, on an average 70* day, it will not keep your engine at 200+ degrees, but it does make it a lot easier to get there. This, plus a folded up t-shirt draped over the car and stuffed into the top will keep the temp up and depending on the wind or cool temps, you may need to use some plastic as a windbreaker. Overall, I'm satisfied with the product and view it as a valuable tool because it does make keeping the temp up easier than tire foam or a sock (which does almost nothing), but it would be better if it was "plug and play" all the way to 200 degrees by itself. It is basically a smaller version of the foam insulation thing for beer cans.
I got mad i just got all my stuff and looked at the sleeve and yes i said sleeve they only gave me one. but it worked really good for me