New box spring for twin XL ( Twin extra long ), made for select comfort mattress but can be used under any TXL mattress. Unopened, came with my new mattress and not needed, want it gone. 38" wide, 79" long. If ad is up, It is still available. LAND LINE PHONE, DO NOT TEXT. Leave a voice mail message with your phone number if I do not answer. We are 10 minutes from Lockport.