https://beekeepers.com/products/checkmite-strips-varroa-mite-treatment
Checkmite is coumaphos, A cholinesterase inhibitor type insecticide used to kill varroa but also approved for control of small hive beetles.
It is sold in 10-paks for $40, this year.
This company sells strips of check mite, off label without, without a lot number or the date the 10-pack was opened.
This product has a limited shelf life.
I bought one strip to use in a beetle barn(s) to control shb, and received the one strip wrapped in handiwrap.
I have written this company twice to inquire lot number and Date opened info with no response.
I suggest one avoid this merchant because you have no idea the condition, quality or effectiveness of what is being sold.
. FYI