Balance identification needed, marked 2850 JR

Question

Good morning,
Length of channel, metal part only is 29 inches.
Pictures of both ends attached.
Please let me know if I got everything you need to help me.
Thank you!

Bob · Accepted Answer

This appears to be an S351-29 or S390-29. Check the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, to determine which you need. For a stamp option 2850.

Comparison of the S351 and S390 balance shoes.