Strong Tubes come in regular 1/2″ diameter and slim 3/8″ diameter widths. 3/8″ diameter are generally more suited for children under the age of 6 or where less drooling is required. Strong Tubes are 85A durometer-Hard and are Chew Factor 3.0 which means they are the most durable chews available. On a lanyard Strap or clip on.
