Size: about 2-3 cm,No nickel,, if you want to wholesale please contact usEnvironmental protection material production,The quality is very goodwe have our own factory,You can customize the Enamel pins, the number of need more than 100pcsWe are a professional enamel jewellery shop. If you like our products, you can go to our shop to see more products, you can pay attention to our shop, we will update our products every month.- We provide dropshipping service- We have sufficient stock- There will be no invoice and promotion information in the package- We can fulfill orders on a daily basis- We do dropshiping in the way as your mentioned:After payment,Items will be shipped out in 24-72 hours