How long are these, in inches?

From tip to tip, it measures 15 inches long.

Would these Neoprene straps hold up well when playing basketball?

These straps would not hold up well under any circumstances. Way too short and they barely fit around the back of my head so not enough of the strap to slide onto glasses frame securely. Look for something different.

For size, what is difference one size or 1pack

It means ..chum comes in one size...one to a pack...that's how mine came...

Can a strap be fed all the way through the retainer?

Good question! Sorry it's been ignored. No, closed-cell foam fills the center portion so you can't (easily) thread a cord through for different attachment options. You can buy closed-cell foam insulation (for refrigerator tubing) with a narrow inside diameter and no longitudinal slit through which you can easily thread any cord with any terminal hardware, whatever works best for you. A bit of that will float far more mass than these neoprene retainers. Unfortunately, I've only ever seen it in black.

チャムズフローティングネオアイウェアアイウェアリテーナブラック

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

眼鏡小物（メンズ）ストアでチャムズフローティングネオアイウェアアイウェアリテーナ、ブラックなどがいつでもお買い得。当日お急ぎ便対象商品は、当日お届け可能です。アマゾン配送商品は、通常配送無料（一部除く）。

Specifications

ASIN	B003CJYOAS
ASIN	B003CJYOAS
Amazon.co.jp での取り扱い開始日	2014/9/9
GTIN (Global Trade Identification Number)	00093039813512
UPC	093039813512
おすすめ度	4.3 5つ星のうち4.3 (894) var
カスタマーレビュー	4.3 5つ星のうち4.3 (894) var dpAcrHasRegisteredArcLinkClickAction; P.when('A', 'ready').execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( 'acrLink-click-metrics', 'click', { "allowLinkDefault": true }, function (event) { if (window.ue) { ue.count("acrLinkClickCount", (ue.count("acrLinkClickCount") \|\| 0) + 1); } } ); } …
カラー	ブラック
サイズ	7.87cm x 15.24cm x 1.78cm
スタイル名	ブラック
パターン	無地
ファスナーのタイプ	Jフック
ブランド名	Chums
メーカーにより製造中止になりました	いいえ
メーカー型番	12178100
ユニット数	1.0 個
商品の重量	0.02 ポンド
商品モデル番号	12178100
商品本体サイズ	15.2 x 7.9 x 1.8 cm
型番	12178100
素材	ネオプレン
衣服サイズの国	日本
製品サイズ	15.24 x 7.87 x 1.78 cm; 9.07 g

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