The Gawds Zack Savage wheel is the well-deserved second pro wheel for this exceptional skater. This flat profile 58mm wheel in 90A is designed with great speed, comfort and grip in mind. The made in USA PU-compound from Gawds is known for being the fastest and longest-lasting in the industry and this wheel follows in those footsteps. Congratulations to Zack on his first Gawds pro wheel. These wheels only work with tube spacers.