Which side is easiest to break the composite? Bumpy side up/down or doesn't matter?

Didn't really seem to matter, really nice product.

Are these strong enough to level a hot tub/spa?

I used mine to level a large outdoor deck (2x6's and deck boards, etc). The whole deck must weigh 2,000 pounds... No issues .

can you staple thru these for hardwood floor installation?

Hello! The shims can be nailed, stapled, etc. We do recommend a staple or nail with as small of a diameter as necessary to facilitate successfully securing the flooring. If the diameter of the staples/nail is too big, then it may cause the shim to crack. We hope this helps!

Number of Items	36
Manufacturer	Stock Your Home
Part number	2602
Item Weight	821 g
Product Dimensions	19.69 x 3.81 x 0.64 cm; 821 g
Measurement System	Inch
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	19.7 x 3.8 x 0.6 cm

コンポジットシム (36個パック) – ハードコンポジットシム ホームリフォーム用 – レベリング用シムが腐らない – レストランテーブルシム – テーブルウェッジ – トイレシム – DIY家具レベラー – ご自宅のストックに

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コンポジットシム (36個パック) – ハードコンポジットシムホームリフォーム用 – レベリング用シムが腐らない – レストランテーブルシム – テーブルウェッジ – トイレシム – DIY家具レベラー – ご自宅のストックに