Appears to be a quality product. I didn't buy it for wheel balancing. more likely to balance the telescope, and also recognized that they would do well to add weight to model trains. I think I will find an additional use for them and I am happy with my purchase. The only problem is the delivery. The approx. 6" x 3" x 2" box arrived in an approx. 10" x 7" x 5" mailer box (extra large) with the remains of two small airbag inlays (on the our children like to stamp). All weights were removed from the product box and rotated except for two separate weights that were permanently attached to the inside of the shipping box. Very strong adhesive. I think in a collision with an asteroid these charges stay on your wheels. The tape sealing the box of product was intact, but the folded edge of the box lid just fell off. Two inflated pillows would never have been enough anyway, but they were knocked over by a 4lb box with a sledgehammer, probably just before those weights destroyed their own packaging, probably the first time the box was thrown or dropped en route. In addition to the two weights that were taped to the inside of the shipping box, maybe half a dozen other adhesives got damaged (weights stuck together, etc.), rendering them unusable. So 5 stars for product, 1 star for performance/packaging.