These are extra elastomer inserts for the Cane Creek Long Travel Thudbuster suspension seatpost.
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The Cane Creek Long Travel Thudbuster comes with a medium elastomer insert. If you are outside the 65-90kg rider weight you may want to consider a different elastomer. 

No tool insertion and removal!

Elastomer typeRider weight (kg)
Extra softless than 65kg
Extra firm95-115