This is a new very high quality and very correct pair of blocking rings for the T90 three speed transmission. This transmission takes two of these. These are bad about the corners betting worn off of the notches and the internal grip rings wearing out as well.  That is sometimes why your transmission will jump out of second gear when you get off the accelerator to coast. Yes, there can be other reasons why your transmission pops out of second. Like the small teeth on 2nd gear being worn out but these normally need replacing in a rebuild.  This sale is for two rings.      QTM parts