Thes are a food Safe Biodegradable plant based produt. Included is 10 forage cups with lids. Great for practicing foraging with your birds. Fill them with whatever treat or little toy your birdy loves. You can also put a hole through the top and bottom and thread a piece of leather through and tie it closed for an even more challenging forager. The cups are about an 1 1/2" high and taper up from 2 1/2" to 3" at the top.