Rugged polystyreneWill last for yearsHot and cold sterilizedHolds a seed flat, or cell insertDimensions: 11" x 22" x 2 1/2" Add the D2211 Clear Humidity Dome or V2211 Clear Vented Humidity Dome for seed starting.Renamed part number. Previous part number PNT1122
Add the D2211 Clear Humidity Dome or V2211 Clear Vented Humidity Dome for seed starting.Renamed part number. Previous part number PNT1122