- Dimensions: 19.5 x 49 mm - Inner diameter: 19.5 mm - Ring size: 9-11 - Wall thickness: 3 mm Regular - Material: Ceramic - The moulded ceramic version has a very hard surface like glass but produces more low end and sustain as it is heavier than the glass or brass Rock slides - Colour: Pacific Dark Blue EUR 38.00 - See more - Buy online