This listing is for a lot of 55 pieces of multi colored tattoo machine rubber o-ring spacers. These spacer o-rings are made for use with long nipple armature bars so you can space out the proper needle bar distance for tube centering. This listing has 11 different colors that you will receive 5 pieces of each color totaling 55 pieces. These o-rings are the larger style for a more bold look to match your machine. They have 3mm center holes and have a overall diameter of about 6.5mm. They are roughly the same size diameter as a standard needle bar grommet. Please write with any questions and buy with confidence. Shipping is to the USA only. Thanks, JC.