270 Pc. HNBR R12 and R134a O-Ring Assortment Highly saturated nitrile butyl rubber works with R12 and R134a . Molded storage case included . Assortment contains: . (20) 7/32 x 1/16 . (20) 1/4 x 1/16 . (20) 6.8 x 1.9 . (20) 5/16 x 1/16 . (20) 7.8 x 1.9 . (20) 8 x 2 . (20) 8.8 x 1.9 . (15) 7/16 x 1/16 . (15) 7/16 x 3/32 . (15) 11 x 2 . (15) 12 x 2 . (10) 13.9 x 1.8 . (10) 9/16 x 3/32 . (10) 14 x 2 . (10) 15 x 2 . (10) 17 x 2 . (10) 11/16 x 1/16 . (15) 11/16 x 1/8 356 Yes - DI(2-ETHYLHEXYL)PHTHALATE (DEHP)