Filling With A Solution That Is Too Hot Can Warp The Plastic & Damage The Mechanisms. Containers Are Not ''Water Tight'', So Pouring Too Hot Can Also Cause Leaking (Until The Formulation Solidifies). Compatibility Testing Is Always Recommended. Set Includes Natural Round Twist-Up Tube W/Screw-On Cap. 2 Oz (57G) Capacity Polypropylene. #5 Recyclable Bpa Free (Product Is Not Manufactured With Bpa, Bps, Dehp, Dbp, Bbp, Dinp, Didp, Dnop, Pfoa, Pfos, Pvc, Hips Mercury Or Lead) Height W/Out Cap: 4'' Height W/Cap: 5'' Diameter: 1.5'' Label Area Around Container: 5'' Label Area Height: 3'' Compatible Label Sizes: 4X2, 2.75X2.75, 2X2, 1.67'' Circle, 2.5'' Circle (1X2.625 Or .5X1.75 Will Also Work, But Are Very Small Compared To Size Of Container) Please Note That Container Has A Slight Taper, So Labels Larger Than Those Recommended Will Need To Be Tested.