Very popular, extremely durable and amazingly practical playtraining innovation. Use them to teach basic gymnastic movements, improve balance and coordination, mark out walkways or relay courses...and for dozens of other activities. Norbert’s 30" x 3" x 3". Speed Bumps are filled with very forgiving prime 70 ILD polyfoam and encased in colorful, washable 18 oz. coated vinyl for years of use. Sold in sets of six.