They are 10mm and have a holesize in 4,7mm, so they fit perfectly on the Predator Tubes wich are 4,6mm, the weight is 0,60grams, so they are easy to cast. To start with we made theme in Silver-Gold-Black - Mat Metallic Olive - Mat Metallic Red - Metallic Golden Orange These Coneheads are very high quality 10 in a pack