This closed bottom surface marker is made of high visibility yellow or orange airtight nylon. Inflated orally or by use of BC low pressure inflator hose.
 
“No-Lock” Inflator keeps BC hose from locking on
Dump/overpressure valve with manual pull cord
Nylon loop to aid in stowing when deflated
Stainless Steel “D” ring for attaching line
Closed bottom prevents accidental deflation
3.3 feet long (1 meter) or 6 feet