Lonsdale l core extra heavy punch bag the lonsdale l core extra heavy punch bag is constructed from the finest hide leather outer shell this bag has unique l core technology which delivers a more responsive feel and reduces shock impact to your wrist and hands the bag has a blended inner fill for superior feel and shape this is a heavy bag for a harder workout this is fitted with a d ring bottom for additional stability if required laced top and the l core extra heavy punch bag require