from listing page Small Gas Springs

Gas Spring
GGN54-P1=5 POUNDS EF015-02B 2.50" STROKE, BLACK NITRIDE

Item: GGN54-005-A

Guden Item GGN54-005-A
Price Information
$27.72 each for 1 - 2 pieces, in stock, $25 min for US orders,
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(Qty 2 and Qty 3 are optional)
Item Information
.160 .470
2.400 7.550
5 M4-0.7
Steel tube Nitride rod
Alternate item is suggested