0 Sigma SKU: 423C Silica Sound 423 Clear Length: 2.1" (Shorty) Outside Diameter: 28.0 mm ( ~ 1.1") Inner Diameter (clear glass): 20.0 mm (Ring size 10.25) Inner Diameter Of Taper: Usually... $24.00 Decrease Quantity of undefined Quantity Increase Quantity of undefined Add to Cart The item has been added