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We offer traditional 21mer duplex RNAs as well as 27mer, Dicer-substrate RNAs (DsiRNAs), which engage the Dicer enzyme natural siRNA processing pathway.
If you know the sequence you want to order, you can order traditional siRNAs from the Order tab at https://www.idtdna.com/ by selecting Main Menu>Custom RNA Oligos.
DsiRNAs can be ordered at https://www.idtdna.com/site/order/duplexentry/index/dicer. See the DsiRNA selection tool that can be accessed under "Gene Silencing" on the Products tab of our website.