The Matthews 4.5 In. Vacuum Cup with 5/8 In. Pin has 5/8 inches pins, in single and double configurations. The 10 inches Pump Cup is a heavy-duty style without 5/8 inches pins. Pump it until the red marker disappears to create an amazing bond to nonporous surfaces. A common use is for camera shots on car hoods in conjunction with the 4-Way Tilt Plate and camera tie-down strap. Sometimes you do not have enough room for a 4 inches or 6 inches round suction cup when mounting your lights or camera to a slick or smooth surface. The new, oval-shaped, suction cup from Matthews measure 6x3 inches and can fit into those tight, odd shaped places, ensuring a safe placement of your equipment.