What material is it? Buna, epdm, viton, or hbnr?

They can be either Neoprene or Buna. But since 134-A has become the main AC refrigerant for the US auto manufacturers I would think these are neoprene and not Buna. It does not say on the packaging. The color is a bit more pale of a green or I should say chalkier than the ones I took off.

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270 Pieces Seal Gasket Washer,O Ring Assortment Set Kit,Car Air Conditioning AC O Ring Kit,Sealing ORings Gasket Assortment Set,Rubber Washer Orings for A/C Professional Plumbing

270 Pieces Seal Gasket Washer,O Ring Assortment Set Kit,Car Air Conditioning AC O Ring Kit,Sealing ORings Gasket Assortment Set,Rubber Washer Orings for A/C Professional Plumbing

Product ID: 560523222

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Details

Material
Rubber
Brand
Reswish
Colour
Green
Manufacturer
ESEWALAS
Net Quantity
2.7E+2 Count

🧴oil & gasoline resistant

♻️eco-friendly rubber

🛠️270 pcs multi-size kit

Description

🔧 Seal the deal with the ultimate O-ring arsenal!

BUILT TO LAST - Premium rubber resists corrosion, heat, deformation, and wear for reliable performance.
CLEAN GREEN - Eco-conscious material with no odor or pollution—safe for you and the environment.
ALL SIZES COVERED - 270 precision O-rings in 18 versatile sizes to fit every sealing need.
ORGANIZED PORTABLE - Transparent compartment box keeps your O-rings sorted and ready on the go.
UNIVERSAL COMPATIBILITY - Perfect for A/C systems, plumbing, automotive, appliances, and more—be the pro with the right seal.

This 270-piece O-ring assortment kit features high-quality, eco-friendly rubber rings in 18 sizes, designed for superior resistance to oil, gasoline, heat, and wear. Packaged in a transparent organizer, it’s ideal for professional plumbing, automotive A/C, and versatile sealing applications.

Specifications

Material	Rubber
Brand	Reswish
Colour	Green
Manufacturer	ESEWALAS
Net Quantity	2.7E+2 Count
Number of Pieces	270
Country of Origin	USA
Model number	345LSMFQ001
Number of Memory Sticks	270
Item Weight	132 g
Package Dimensions	20.7 x 10.49 x 3.2 cm; 132 g
Item model number	345LSMFQ001
Included Components	O-Ring Assortment

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