Clear Glass 30-oz Chalkboard Canister Jar with with Locking Clamp Lid 6-inch High ~ Chalk Included. Durable glass Chalkboard Canister jar with Locking Clamp Lid Perfect for food storage and display on kitchen counters Dimensions: 4x4" in diameter x 6-inch high. Capacity 30-oz. Write on these jars with included chalk and wipe clean with a damp cloth. Ideal for writing contents, a clever comment or names.