Substance

AC

Cloth, paper, rope

11

Crystal, glass, ice

13

Wood, bone

15

Stone

17

Iron, steel

19

Mithral

21

Admantine

23

Object Hit Points

DMG pg. 247

Size

Fragile

Resilient

Tiny [bottle, Lock]

2 [1d4]

5 [1d4]

Small [Chest, Lute]

3 [1d6]

10 [3d6]

Medium [Barrel, Door]

4 [1d8]

18 [4d8]

Large [Cart, Window]

5 [1d10]

27 [5d10]