Trailer Wheels 12 Silver Machined Lip is a twin-dished 5 spoke model. Trailer Wheels 12 features a sleek Silver Machined Lip finish. Trailer Wheels 555 Chrome is ISO 9000, OEM, SEA, JWL-T, VIA, & TUV. Strong and proud, lean on Trailer Wheels 555 Chrome in the toughest of times!