This product is an alignment shim designed for front-wheel drive vehicles. It is manufactured by Specialty Products and has a part number of 71531. The product is accompanied by a warning that it contains chemicals known to cause cancer, birth defects, or other reproductive harm, as per California Prop 65.
I used this for fixing the rear alignment on my 2003 VW Golf. The shims I used said +1 deg camber. After installation, alignment showed it added just that.
Its not too hard to do yourself. Jus may need a gear puller to remove the outer rear bearing for access.