A good seal hop up is defined by the material from which it is manufactured. The higher the quality, the more the effect will be clear and precise without being obliged to the maximum setting. If the weight of the ball is well chosen, it usually suffices to just mount it so that the effect is optimal. Phoenix Airsoft offers several joint Hop Up models allowing you to make your choice according to performance and optimization that you want to assign to your reply. Hop Up seal is part of the range ofairsoft internals.