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You can buy a roll and cut it to the sizes you need.
https://www.amazon.com/Awesome-Aquatics-Anchors-Weights-Ribbon/dp/B074D7QMYN/ref=asc_df_B074D7QMYN/?tag=hyprod-20&linkCode=df0&hvadid=198060275213&hvpos=1o2&hvnetw=g&hvrand=9048486554137005297&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9007683&hvtargid=pla-354913206196&psc=1