Here's a set of studded winter ice tires that I put together for a child's bike. The tires are very hard rubber with big lugs and I've not lost a stud while using them. Tubes are included. The wheel liners (old inner tubes) are also included to keep the studs from puncturing the tube. Each wheel has 58 studs. The studs are 4mm wide and 9mm long Marrkey carbide studs. I included six extra studs and an install tool.