This component is a 2 part component that requires trimming on the ball where it separates from the sprue / runner . Choosing the correct material for this component is important to ensure durability and easy flow of the camera inside its housing. All components require full and complete purging of the barrel but our white components are where we take care special care in checking for signs of black speks / marks. Acquiring the highest quality purging materials, pigments and masterbatches are all important considerations in giving our customers quality products in a timely manner