New without original packaging, Lot of 10.
These solid, black stoppers contain a high percentage of pure rubber, weigh less than neoprene, and are low in free sulfur (1/2%).
  • Resilient and pliable for a long time
  • Low in free sulfur
  • Can withstand adverse laboratory conditions without hardening
  • Length 21 mm
  • Top Diameter 13 mm
  • Bottom Diameter 8 mm