Information Medi-Pak Hot Wheat Pack is filled with Australian treated wheat, microwavable and is great for injuries requiring heat therapy, such as aches and pains in joints, shoulders, back and abdomen. Dimensions 20cm x 19cm.Warnings Suitable for turntable microwaves only. If bag is overheated and bag has a burnt smell discard immediately. Place on dry clean microwave only. Directions and ingredients How To Use Heat in microwave for 1.5 minute going up by 20 second intervals until desired heat is reached. Place onto dry clean surface only. Replace wheat pack every 12 months or if contaminated or has become wheat replace immediately.