For your consideration is this awesome pair of 2013 Ibanez RG450DX cosmo black knurled dome snap-on knobs. These knobs are in good pre-owned condition; they do show some wear and as such the color is somewhat more silver in appearance. These knobs are 18.25 mm in diameter and 18.17 mm in height from base to crown. They will work with a wide array of guitar models and will fit most any industry spec 6 mm pot shaft. Buy It Now and buy with confidence. Please feel free to ask any questions you may have. Thank you for looking at my listing. FAST & FREE SHIPPING!!!