Standard Nets feature 3/4" (2 cm) horizontal and 1/2" (1 cm) vertical rope. Heavy-Duty Nets use the thicker 3/4" (2 cm) rope both horizontally and vertically, to easily handle multiple users without sagging. Use 12" (30 cm) sq mesh for middle school ages and up, 9" (23 cm) sq mesh for elementary ages. All have nonslip hitch lanyards for easy attachment to ceiling hardware; a minimum of 5 attachments is recommended per net. Net includes installation instructions, as well as information on usage, maintenance, and activities. Indoor use only. Mats, spotting, and adult supervision required.