This excellent set of Reusable Ceramic Ring Sizing Pellets is an excellent way to ensure your ring will maintain its size and shape during firing.Why risk incorrect shrinkage with your PMC rings when sintering and why spend money on disposable pellets when this set of 20mm pellets can be used again and again. Quality made in Japan.Longer than our 20mm pellets, these 30mm pellets are excellent for broader rings and jewelry, especially ones that will hold larger gems and stones.Unlike other products, these pellets are not disposable and can be used again and again. Never run out of pellets again, with this excellent value product.To use this x30 Reusable Ceramic Ring Sizing Pellets Firing PMC Silver Clay Rings 30mm, simply wrap the pellet in ceramic tape and hold in place with cello tape or scotch tape before placing it inside your dried PMC ring and firing in your kiln. Once firing is complete, allow to cool and remove the pellet for later use.The sizes printed on the pellets are Japanese sizes, please see the table below for approximate equivalent sizes:United States, Canada United Kingdom, Ireland, Australia, New Zealand India, China, Japan, South America Italy,     • 1, B, 1     • 2, D, 2, 1.75     • 2½, E, 3, 3     • 3, F, 4, 4.25     • 3¼, F½, 5, 4.75     • 3¾, G½, 6, 6     • 4, H, 7, 6.75     • 4½, I, 8, 8     • 5, J½, 9, 9.25     • 5½, K½, 10, 10.5     • 6, L½, 11, 11.75     • 6¼, M, 12, 12.5     • 6½, M½, 13, 13.25     • 7, N½, 14, 14.5     • 7½, O½, 15, 15.75     • 8, P½, 16, 17     • 8½, Q½, 17, 18.25     • 9, R½, 18, 19.5     • 9½, S½, 19, 20.75     • 10, T½, 20, 22     • 10¼, U, 21, 22.75     • 10½, U½, 22, 23.25     • 11, V½, 23, 24.75     • 11½, W½, 24, 26     • 12, X½, 25, 27.25     • 12½, Z, 26, 28.5     • 12, 3/8, N/A, 27, 29.75     • 12, 3/4, N/A, 28     • 13, 1/8, N/A, 29     • 13, 3/8, N/A, 30No English instruction available.