Our weighted tails incorporate a weight system that is built into the tail extension. The system features a threaded rod and three sets of weights that equal a total of 16 ounces. The weights slide onto the rod and are held in place with a lock nut. The weights are interchangeable – you can utilize 4 ounces, 8 ounces, 12 ounces or 16 ounces simply by unscrewing the nut, and adding or removing the weights to get the total amount of weight you want. And with the Custom Tails weight system, everything is removable! The weights slide off the threaded rod, and the threaded rod pulls out of the top of the tail extension. This gives you the option of utilizing your tail extension with or without the weight system, all with minimal assembly!